chore(schema-compiler): move preAggregations class to typescript

[KSDaemon]

Finally, move PreAggregations from js to ts with most of the types described! 🎉

Also switching to TS uncovered some incorrectness that is now fixed!

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 61.64%. Comparing base (ef3a04b) to head (93cf873).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ejs-schema-compiler/src/adapter/PreAggregations.ts	92.85%	3 Missing and 2 partials ⚠️
...es/cubejs-schema-compiler/src/adapter/HiveQuery.ts	0.00%	3 Missing ⚠️
...s/cubejs-schema-compiler/src/adapter/BaseFilter.ts	0.00%	0 Missing and 1 partial ⚠️
...bejs-schema-compiler/src/adapter/CubeStoreQuery.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9538      +/-   ##
==========================================
- Coverage   61.75%   61.64%   -0.11%     
==========================================
  Files         174      174              
  Lines       14434    14474      +40     
  Branches     2464     2576     +112     
==========================================
+ Hits         8913     8923      +10     
- Misses       5155     5169      +14     
- Partials      366      382      +16     

Flag	Coverage Δ
cube-backend	61.64% <87.50%> (-0.11%)	⬇️

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[ovr]

🔥 Awesome! Great to see that it finally happens and TS is here for pre-aggs!

[mcheshkov]

I think we can land this for integration purposes, and improve on it later.