feat(api-gateway): Introduce cache mode option for /cubesql API

[KSDaemon]

Check List

• Tests have been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

❌ Patch coverage is 43.33333% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.42%. Comparing base (8398538) to head (00b37ce).

Files with missing lines	Patch %	Lines
rust/cubesql/cubesql/src/compile/engine/df/scan.rs	20.00%	8 Missing ⚠️
rust/cubesql/cubesql/src/transport/service.rs	37.50%	5 Missing ⚠️
...t/cubesql/cubeclient/src/models/v1_load_request.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9972      +/-   ##
==========================================
- Coverage   83.44%   83.42%   -0.02%     
==========================================
  Files         254      254              
  Lines       75091    75121      +30     
==========================================
+ Hits        62660    62673      +13     
- Misses      12431    12448      +17     

Flag	Coverage Δ
cubesql	83.42% <43.33%> (-0.02%)	⬇️

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[igorlukanin]

@KSDaemon Should we document what each option is supposed to do in the code? I feel like it might get lost in Jira/docs at some point 😄

[KSDaemon]

Well, why not...