Implement NVR download for Reolink recordings

[starkillerOG]

Breaking change

Proposed change

Implement NVR download for Reolink recordings instead of using FLV streams.
Advantages:

• recordings can now be split in chunks of 5 minutes (hardcoded as a CONSTANT in HA, can be changed) instead of the full file duration of 60 minutes
• the FLV stream can not be skipped ahead, so you need to watch the full 60 minutes to reach the end, with this download method you can skip ahead as soon as that portion of the mp4 is downloaded, download goes pretty fast depending on NVR upload speed and the network speed.

Disadvantages:

• startup is a few seconds slower since this download method takes 2 steps: 1) request the NVR to prepare a mp4 for the 5 minute time chunk from the original 60 minute file which is on the NVR harddrive, this takes 1-2 seconds (extra time), 2) actually start downloading the chunk.mp4 once the NVR indicates the preperation is done. with the FLV method you can emidiatly start streaming (only step 2).

TO DO:

• adjust tests
• requires a new release of reolink-aio

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 #
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• The code change is tested and works locally.
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