Add Simple Storage Component

[drew2a]

This PR is a part of #6718. It introduces the Simple Storage Component.

The reason to introduce this component: in #6718 I need persistent storage for the last_processed_torrent_id that is used by TagComponent during rules processing.

Normal Tribler's approach is either to store values in SQL or to store values in separate files.

Examples

The SQL approach includes:

tribler/src/tribler-core/tribler_core/components/metadata_store/db/orm_bindings/misc.py

Lines 5 to 13 in eed41c7

	class MiscData(db.Entity):
	"""
	This binding is used to store all kinds of values, like DB version, counters, etc.
	"""
	name = orm.PrimaryKey(str)
	value = orm.Optional(str)
	return MiscData

With actual data:

db_version,13

The file approach includes using a single file like exitnode_cache.dat to store a small amount of persistent data.
Another example: sometimes Tribler uses the config file like persistent storage:

tribler/src/tribler-core/tribler_core/components/libtorrent/download_manager/download_manager.py

Line 271 in eed41c7

self.config.port = ltsession.listen_port()

tribler/src/tribler-core/tribler_core/components/libtorrent/download_manager/download_manager.py

Line 906 in eed41c7

def set_libtorrent_proxy_settings(config: LibtorrentSettings, proxy_type, server=None, auth=None):

Solution

Instead of using multiple small files, or "config-like-a-storage" or SQL tables for nonSQL data, we can use the one single JSON storage which is more suitable for these needs.

Simple Storage

Simple Storage is object storage that stores data in JSON format and uses pydantic BaseModel class for defining models.

The writing procedure calls every 5 minutes as well as on shutdown.

Heavier alternatives:

• https://pypi.org/project/pickleDB/
• https://docs.python.org/3/library/dbm.html

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