This commit introduces the following breaking changes:

- Three new classes have been added:
  - ChannelTabExtractor, class extending ListExtractor<InfoItem>, which
  extracts InfoItems from a channel tab;
  - ChannelTabInfo extending ListInfo<InfoItem>, which extracts InfoItems from
  a ChannelTabExtractor and returns them as a ChannelTabInfo;
  - ChannelTabs, an immutable class containing all supported channel tabs.
- StreamingService implementations must implement new methods returning a
channel tab LinkHandlerFactory (getChannelTabsLHFactory) and a
ChannelTabExtractor (getChannelTabExtractor);
- ChannelExtractor inherits Extractor instead of ListExtractor<StreamInfoItem>
and ChannelInfo inherits Info instead of ListInfo<StreamInfoItem>;
- ChannelExtractor and ChannelInfo have now getters and/or setters of tabs.

Co-authored-by: ThetaDev <[email protected]>
Co-authored-by: Stypox <[email protected]>

Tags' getters and/or setters have been added in ChannelExtractor and
ChannelInfo to do so.

Co-authored-by: ThetaDev <[email protected]>

…y getId and getUrl methods of LinkHandlerFactory and its base implementations

This change advertise to clients that channel tabs' link handler factories can
return an UnsupportedOperationException when a tab provided to them is
unsupported.

This class makes easier for LinkHandlerFactory implementations to declare an
UnsupportedOperationException.

…fo.getTabs() when a specific tab's data has already been fetched

This new ListLinkHandler, ReadyChannelTabListLinkHandler, should help saving
clients data, energy and time by helping to reduce duplicate requests.

Co-authored-by: Stypox <[email protected]>

Support of channels and videos has been added for accounts and support of
videos and playlists has been added for video channels.

The following changes have been also done:
- collectStreamsFrom method in PeertubeParsingHelper has been renamed to
collectItemsFrom;
- PeertubeChannelInfoItemExtractor.getStreamCount method has been fixed due to
ChannelExtractor's new inheritance;
- the declaration of the UnsupportedOperationException exception thrown has
been added to the service's LinkHandlers;
- a channel tab LinkHandlerFactory has been added,
PeertubeChannelTabLinkHandlerFactory;
- all service's LinkHandlers are now using properly the singleton pattern.

Co-authored-by: ThetaDev <[email protected]>
Co-authored-by: Stypox <[email protected]>

Support of tracks and albums has been added for artists.

Also use the singleton pattern and add the declaration of the
UnsupportedOperationException exception to the service's LinkHandlers and
improved some code in the files changed.

Co-authored-by: ThetaDev <[email protected]>
Co-authored-by: Stypox <[email protected]>

Support of tracks, playlists and albums has been added for users.

Also add the declaration of the UnsupportedOperationException exception to the
service's LinkHandlers.

Co-authored-by: ThetaDev <[email protected]>
Co-authored-by: Stypox <[email protected]>

…atterns

This is required to parse duration of YouTube's reelItemRenderers, returned
only inside accessibility data.

Co-authored-by: ThetaDev <[email protected]>

…annels

Support of tags and videos, shorts, live, playlists and channels tabs has been
added for non-age restricted channels.

Age-restricted channels are now also supported and always returned the videos,
shorts and live tabs, accessible using system playlists. These tabs are the
only ones which can be accessed using YouTube's desktop website without being
logged-in.

The videos channel tab parameter has been updated to the one used by the
desktop website and when a channel extraction is fetched, this tab is returned
in the list of tabs as a cached one in the corresponding link handler.

Visitor data support per request has been added, as a valid visitor data is
required to fetch continuations with contents on the shorts tab. It is only
used in this case to enhance privacy.

A dedicated shorts UI elements (reelItemRenderers) extractor has been added,
YoutubeReelInfoItemExtractor. These elements do not provide the exact view
count, any uploader info (name, URL, avatar, verified status) and the upload
date.

All service's LinkHandlers are now using the singleton pattern and some code
has been also improved on the files changed.

Co-authored-by: ThetaDev <[email protected]>
Co-authored-by: Stypox <[email protected]>

…s with the Test JUnit annotation

These changes should help to detect tests as tests, when running a subset of
tests or all tests.
They should be also implemented in these interfaces' implementations (new and
existing ones).

Co-authored-by: ThetaDev <[email protected]>

…returned by a channel extractor

Only the first content filter of the ListLinkHandler instances provided is
used when collecting all channel tabs of the ListLinkHandler list, as channel
tabs implementations only use one content filter per ListLinkHandler instance.

Co-authored-by: ThetaDev <[email protected]>

… on tests

Tests in BandcampChannelExtractorTest and BandcampChannelLinkHandlerFactoryTest
have been also fixed.

Co-authored-by: ThetaDev <[email protected]>

… on tests

Co-authored-by: ThetaDev <[email protected]>

… on tests

Co-authored-by: ThetaDev <[email protected]>

…es on tests

Co-authored-by: ThetaDev <[email protected]>

…d channels tabs and tags changes on tests

Co-authored-by: ThetaDev <[email protected]>