feat(schema-compiler): Use LRU for CompilerCache to reduce memory usage

[ovr]

Memory improvements:

• QueryCache now uses a Map instead of nested objects (storage['a']['b']['c'] that could grow unbounded) for cleaner storage
• CompilerCache now uses an LRU limit of 10k objects (i've separated global cache to from QueryCache). No more memory leaks.

Performance optimization:

• New computeCacheKey() function is ~3x faster than JSON.stringify for common cases
• Uses V8's ConsString optimization (string concatenation builds a tree of segments instead of copying)
• Strings and numbers are concatenated directly; only objects fall back to JSON.stringify

[ovr]

  // For key ['a', 'b', 'c']:
  // storage['a'] = {}
  // storage['a']['b'] = {}
  // storage['a']['b']['c'] = fn()

I don't know the reason (I assume, string interning) for writing such a nested cache, but I am certain that it's better to rewrite it. I've done fastComputeCacheKey and tested that it's using ConsString

[KSDaemon]

🔥

[codecov]

Codecov Report

❌ Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.12%. Comparing base (5df4280) to head (f2a453a).
⚠️ Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
...s/cubejs-schema-compiler/src/adapter/QueryCache.ts	82.60%	3 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (5df4280) and HEAD (f2a453a). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5df4280)	HEAD (f2a453a)
cubesql	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10247       +/-   ##
===========================================
- Coverage   83.25%   55.12%   -28.14%     
===========================================
  Files         247      221       -26     
  Lines       74259    17128    -57131     
  Branches        0     3505     +3505     
===========================================
- Hits        61826     9442    -52384     
+ Misses      12433     7187     -5246     
- Partials        0      499      +499     

Flag	Coverage Δ
cube-backend	55.12% <88.57%> (?)
cubesql	?

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