Validator consolidation

[henneberger]

Separation of validator with planner was too cumbersome and didn't produce any tangible benefit.

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (deb6cbe) 52.45% compared to head (6179889) 52.28%.

Files	Patch %	Lines
...java/com/datasqrl/plan/validate/ScriptPlanner.java	88.88%	7 Missing and 3 partials ⚠️
...src/main/java/com/datasqrl/plan/ScriptPlanner.java	58.82%	4 Missing and 3 partials ⚠️
...c/main/java/com/datasqrl/calcite/QueryPlanner.java	0.00%	2 Missing ⚠️
.../src/main/java/com/datasqrl/calcite/SqrlToSql.java	92.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #467      +/-   ##
============================================
- Coverage     52.45%   52.28%   -0.17%     
- Complexity     1172     1173       +1     
============================================
  Files           585      583       -2     
  Lines         17279    17122     -157     
  Branches       2097     2079      -18     
============================================
- Hits           9064     8953     -111     
+ Misses         7154     7120      -34     
+ Partials       1061     1049      -12     

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