185 ship schema with package

[marc-white]

This PR closes #185 by incorporating the schema descriptions (JSON) into the package. This has been done IAW what I think is current best practice for storing & loading data files within a package (https://docs.python.org/3/library/importlib.resources.html#module-importlib.resources).

Whilst doing this, I found a couple of places where the data submodule was doing some ad-hoc local data loads. These have also been updated to use the new pattern.

Open questions:

• Is this how we want to ship schema? How often do the schema need updating, and is it a pain to have to tag a new version every time an update is required?

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.95%. Comparing base (a07470a) to head (bf43d6d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/access_nri_intake/cli.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
- Coverage   96.96%   96.95%   -0.02%     
==========================================
  Files           9        9              
  Lines         626      623       -3     
==========================================
- Hits          607      604       -3     
  Misses         19       19              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[aidanheerdegen]

Some comments and pinged Jo and Tommy for comments.

[aidanheerdegen]

Let me know when you want another review @marc-white

[aidanheerdegen]

LGTM. Just some commented code to delete.