feat: [VideoStitcher] add apis for Create, Read, Update, Delete for VODConfigs

[gcf-owl-bot]

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feat: allowed usage for VODConfigs in VODSession
feat: added token config for MediaCdnKey
feat: added targetting parameter support to Livesession
feat: added adtracking to Livesession
feat: added fetchoptions with custom headers for Live and VODConfigs

docs: Added apis for Create, Read, Update, Delete For VODConfigs. Added vodConfig usage in VODSession. Added TokenConfig for MediaCdnKey. Added targeting_parameter and ad_tracking for Livesession. Added FetchOptions for Live and VOD configs.
PiperOrigin-RevId: 636368401

Source-Link: googleapis/googleapis@30717c0

Source-Link: https://github.com/googleapis/googleapis-gen/commit/cc30711ef8e16d4887d19f677b9382df0ae60ed8
Copy-Tag: eyJwIjoiVmlkZW9TdGl0Y2hlci8uT3dsQm90LnlhbWwiLCJoIjoiY2MzMDcxMWVmOGUxNmQ0ODg3ZDE5ZjY3N2I5MzgyZGYwYWU2MGVkOCJ9

BREAKING_CHANGE_REASON=pre-1.0 library, breaking change as a result of a previously-removed message being added back.

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• VideoStitcher/samples/V1/VideoStitcherServiceClient/create_vod_config.php:25, tag videostitcher_v1_generated_VideoStitcherService_CreateVodConfig_sync
• VideoStitcher/samples/V1/VideoStitcherServiceClient/delete_vod_config.php:25, tag videostitcher_v1_generated_VideoStitcherService_DeleteVodConfig_sync
• VideoStitcher/samples/V1/VideoStitcherServiceClient/get_vod_config.php:25, tag videostitcher_v1_generated_VideoStitcherService_GetVodConfig_sync
• VideoStitcher/samples/V1/VideoStitcherServiceClient/list_vod_configs.php:25, tag videostitcher_v1_generated_VideoStitcherService_ListVodConfigs_sync
• VideoStitcher/samples/V1/VideoStitcherServiceClient/update_live_config.php:25, tag videostitcher_v1_generated_VideoStitcherService_UpdateLiveConfig_sync
• VideoStitcher/samples/V1/VideoStitcherServiceClient/update_vod_config.php:25, tag videostitcher_v1_generated_VideoStitcherService_UpdateVodConfig_sync

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[ajupazhamayil]

Holding the merge as it has a breaking change. I see a previously required parameter GamVodConfig#getStreamId got removed in this PR.

cc: @bshaffer

[bshaffer]

@ajupazhamayil since this is pre-1.0, we can go ahead and merge the breaking change

I took a look at the RevId change, and surprisingly there is no removal of that method in that CL. I imagine it's because the message GamVodConfig was removed in the protos in a previous change, but not in this library (because we don't remove generated classes), and now it was added without the stream_id field.

Either way, I think it's okay to merge this. I've added the BREAKING_CHANGE_REASON