Add video event proxy endpoint for unifiprotect

[lutzvahl]

Proposed change

As of now, unifi protect comes with 2x API endpoints to be used within HA to get
A) a thumbnail for an event: /api/unifiprotect/thumbnail/{nvr_id}/{event_id}:
B) a part of a video from a camera: /api/unifiprotect/video/{nvr_id}/{camera_id}/{start}/{end}:

This CL adds a new proxy endpoint to receive the full video for an event: /api/unifiprotect/video/{nvr_id}/{event_id}. This is needed as the last_changed timestamp of the sensor in HA is not the same as the unifi protect event start date, hence it's impossible in HA to calc the correct start & end timestamps to see the full event video e.g. as part of a notification.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Unifi protect events start and end time not in sync with HA sensor last_changed #129979
• This PR is related to issue:
• Link to documentation pull request: Not yet created, once this one is ready to submit I'll adjust https://www.home-assistant.io/integrations/unifiprotect/#views

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• I have followed the [perfect PR recommendations][perfect-pr]
• The code has been formatted using Ruff (ruff format homeassistant tests)
• [ X Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for Doc update for new endpoint in unifi protect home-assistant.io#35629
  In case the new API proxy endpoint will be accepted, I'll update the docs prior to landing this CL.

If the code communicates with devices, web services, or third-party tools:

• The [manifest file][manifest-docs] has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

[home-assistant]

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[home-assistant]

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[lutzvahl]

Codecov is failing with error: Report creating failed: {"message":"Token required because branch is protected"}
Please advise..

Stale

[lutzvahl]

added link to the doc PR home-assistant/home-assistant.io#35629