Refactor ICD11 Table; Cleanup in-memory search

[rithviknishad]

Proposed Changes

• All ICD11 diagnoses are loaded into the DB from now on. None is skipped.
• ID for entries with icd ID of format (.../<possible_duplicate_id>/mms/...) is now mapped in the following manner:

http://id.who.int/icd/entity/594985340                    -> 594985340  👈 Did not multiply by 1e3 as then it would break existing relations.
http://id.who.int/icd/entity/594985340/mms                -> 5949853400001
http://id.who.int/icd/entity/594985340/mms/unspecified    -> 5949853400003

• New ICD Entries are a superset of previous entries.
• The new table can be used to build relations (for production use, not just metabase purposes anymore)
• The old MetaICD11Diagnosis table can be deleted once metabase queries are updated to the new table.
• Only necessary fields: id and label are loaded onto the in-memory table.
• Lazy load the in-memory table (to prevent read from db before table is created)

Associated Issue

• Fixes NE6Z (ICD-11) not appearing in search care_fe#6299
• Fixes ICD-11- DONOT allow users to pick ICD-11 groups as diagnosis care_fe#6249

Architecture changes

• Remove this section if not used

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (0a4a4c4) 59.11% compared to head (1cc07e6) 59.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1636      +/-   ##
==========================================
+ Coverage   59.11%   59.46%   +0.34%     
==========================================
  Files         207      208       +1     
  Lines       11264    11283      +19     
  Branches     1599     1597       -2     
==========================================
+ Hits         6659     6709      +50     
+ Misses       4405     4372      -33     
- Partials      200      202       +2     

Files	Coverage Δ
...y/management/commands/load_icd11_diagnoses_data.py	85.71% <100.00%> (ø)
care/facility/models/__init__.py	100.00% <100.00%> (ø)
care/facility/models/meta_icd11_diagnosis.py	95.00% <ø> (ø)
care/facility/models/icd11_diagnosis.py	95.45% <95.45%> (ø)
care/facility/static_data/icd11.py	70.00% <75.00%> (-14.85%)	⬇️

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[rithviknishad]

marking as hold for ohcnetwork/care_fe#5293

Edit: planned to be done as a follow-up PR as more understanding is required about how ICD11 is structured.

[nihal467]

LGTM, Tested in local