[python] EEG-BIDS Events replace Annotations; plus adding HED Support

[jeffersoncasimir]

This PR has multiple Loris counterparts:

Events to Annotations: #9032
HED support: #9033

It aims to make the Python pipeline more compliant with the current BIDS standard.

It does so by replacing references of annotations files and terms with references to events files and terms.

It also brings in support for ingesting dataset-level (from dataset-level events.json) and instance-level (HED column in events.tsv) HED Tags.

Current HED limitations:

• Limited support for instance-level events.json
• No support for "value tags"
• No support for "expanded definitions"
• See Loris PRs for Loris-side limitations

It also does some file name refactoring in thedatabase_lib folder to standardize the name structure.
Some logic was also moved to new database_lib files.

MAKE SURE YOU PATCH SQL + ADD BOTH SCHEMAS WITH THE insert_hed_schema.php TOOL IN ACES/LORIS PRS FIRST

[christinerogers]

let's change pr title to [EEG-BIDS/python]...

[cmadjar]

@jeffersoncasimir who would best the best person to review this PR?

[jeffersoncasimir]

I think @regisoc or @laemtl would be since they have both reviewed one of the Loris counterparts