feature/store-session-content-hash-in-session-db-model

[isaacna]

Link to Relevant Issue

This pull request resolves first part of CouncilDataProject/cookiecutter-cdp-deployment#75

Description of Changes

Added session_content_hash to the db model and all relevant places in the event gather pipeline that are necessary to support that.

Will write a script later that retroactively does this for existing session db rows

[codecov]

Codecov Report

Merging #158 (b79810e) into main (0a43a37) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     CouncilDataProject/cdp-backend#158   +/-   ##
=======================================
  Coverage   94.53%   94.54%           
=======================================
  Files          50       50           
  Lines        2544     2548    +4     
=======================================
+ Hits         2405     2409    +4     
  Misses        139      139           

Impacted Files	Coverage Δ
...ckend/tests/pipeline/test_event_gather_pipeline.py	100.00% <ø> (ø)
cdp_backend/database/functions.py	91.21% <100.00%> (+0.04%)	⬆️
cdp_backend/database/models.py	100.00% <100.00%> (ø)
cdp_backend/pipeline/event_gather_pipeline.py	85.75% <100.00%> (+0.03%)	⬆️

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[evamaxfield]

Looks great! Thanks!