Introduce Flat Collection Types

[suddendust]

Description

This PR introduces a database-agnostic type system that can be used to provide compile time type metadata to query parsers, which can use this info to generate type-aware optimisations.

Testing

[x] Added UTs
[x] Tested this in a live env

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

❌ Patch coverage is 97.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.53%. Comparing base (4516200) to head (3083cc1).

Files with missing lines	Patch %	Lines
...e/expression/impl/AliasedIdentifierExpression.java	50.00%	0 Missing and 1 partial ⚠️
...entstore/expression/impl/IdentifierExpression.java	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #259      +/-   ##
============================================
+ Coverage     80.48%   80.53%   +0.05%     
- Complexity     1297     1342      +45     
============================================
  Files           230      230              
  Lines          5948     6005      +57     
  Branches        536      537       +1     
============================================
+ Hits           4787     4836      +49     
- Misses          797      803       +6     
- Partials        364      366       +2     

Flag	Coverage Δ
integration	80.53% <97.33%> (+0.05%)	⬆️
unit	58.45% <97.33%> (+0.48%)	⬆️

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[puneet-traceable]

LGTM