Tidy position

[CBroz1]

Description

This PR primarily seeks to reduce complexity in the position pipeline to prepare for future expansion. To that end ...

• pyproject.toml specifies the headless version of opencv for testing make_video
• position/position_merge.py - removed unused imports as holdover from Remove classes for usused tables #1003
• within position/v1/ ...
  • dlc_decorators.py served limited utility to enforce the source enum present in DLCModelSource
  • dlc_utils.py
    • OutputLogger context was replaced by a file_log decorator that serves the same purpose without requiring the additional indent
    • _convert_mp4 had some redundancy eliminated by extracting components into separate functions
    • utility functions from other scripts were migrated here
  • dlc_utils_makevid.py was added to collapse similar functions across DLC and Trodes implementations
  • various make functions were de-indented because of new logging decorator
• Across a handful of places, I've added deprecation warning lines that also monitor usage of functions not directly called in the code base. If unused, these functions should be deprecated. These include
  • dlc_reader.py - Complex class that should be refactored
  • dlc_utils.py - directory lookup functions that are holdovers from element_deeplabcut
  • The log itself is stored in common_usage.py

Changes elsewhere include...

• Adding spellchecking to the tests directory
• Adjusting some tests to reflect new error types (eg AssertionError -> FileNotFoundError)
• Adding some test imports where failures occurred from partial stepwise runs
• populate_all_common - while debugging the VideoFile ingestion process for the test files, I
  • removed redundant calls to table populates and get_config.
  • further cleaned up log lines to put variables at the end for easier monitoring of the many log lines during ingestion
  • get_config now caches that a config does not exist, so spyglass doesn't attempt to look up the config and warn on fail to find many times in ingest
  • get_config also accepts an optional arg to determine which table called for the config file
• PositionIntervalMap, related to pop_all redundancy, discussed in Populate should leave evidence of success state #849
  • Null entries are populated to avoid rerunning keys
  • convert_epoch_interval... changed to check for null entries, and delete/repopulate on populate_missing

This PR depends on two features fetched from #1002

• dj_helper_fn.py:L264 - fetch_nwb limits the query_table restriction to only the pk to avoid a restriction with a python dict being run in SQL
• tests/data_downloader.py - refactor of how to wait for downloads in progress

Checklist:

• No. This PR should be accompanied by a release: (yes/no/unsure)
• N/a (If release) I have updated the CITATION.cff
• I have updated the CHANGELOG.md
• I have run the position tests
• N/a I have added/edited docs/notebooks to reflect the changes