[mock_uss] Better slow update check

[the-glu]

Follow #1333

Improve slow update check in mock_uss by doing a proper slow update check.

This also make notification coming faster instead of having arbitrarily in the middle of the flight.

Idea is the following:

• Compute average update rate with a moving window of 3 seconds.
• Check for % of update rate bellow the required rate with a moving window of 10 (over the averages update rates)

Notifications are created for each "non-compliant bucket", and placed in time at the end of the bucket, making them more realistic. However, windows spans are quite arbitrary.

[BenjaminPelletier]

Note: the errors in an earlier failed CI run for cfcc7d6 looked like the below. Retrying the failed jobs made them succeed without changing anything.

Fetching submodules
  /usr/bin/git submodule sync
  /usr/bin/git -c protocol.version=2 submodule update --init --force --depth=1
  Submodule 'interfaces/astm-utm/Protocol' (https://github.com/astm-utm/Protocol) registered for path 'interfaces/astm-utm/Protocol'
  Submodule 'interfaces/automated_testing' (https://github.com/interuss/automated_testing_interfaces) registered for path 'interfaces/automated_testing'
  Submodule 'interfaces/rid/v1' (https://github.com/uastech/standards) registered for path 'interfaces/rid/v1'
  Submodule 'interfaces/rid/v2' (https://github.com/uastech/standards) registered for path 'interfaces/rid/v2'
  Cloning into '/home/runner/work/monitoring/monitoring/interfaces/astm-utm/Protocol'...
  Cloning into '/home/runner/work/monitoring/monitoring/interfaces/automated_testing'...
  Cloning into '/home/runner/work/monitoring/monitoring/interfaces/rid/v1'...
  Cloning into '/home/runner/work/monitoring/monitoring/interfaces/rid/v2'...
  From https://github.com/astm-utm/Protocol
   * branch            63ba6c5ff9c9abb93c55fbdf2bffc0b089d10c4a -> FETCH_HEAD
  Submodule path 'interfaces/astm-utm/Protocol': checked out '63ba6c5ff9c9abb93c55fbdf2bffc0b089d10c4a'
  Error: fatal: could not read Username for 'https://github.com/': terminal prompts disabled
  Error: fatal: the remote end hung up unexpectedly
  Error: fatal: Fetched in submodule path 'interfaces/automated_testing', but it did not contain 3e6060bd6d5cd665eb5cc60ec7aaeab104547769. Direct fetching of that commit failed.
  Error: The process '/usr/bin/git' failed with exit code 128