feat(cubesql): Support SQL push down for more functions

[MazterQyou]

Check List

• Tests has 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

Description of Changes Made

This PR adds SQL push down support for these functions:

• NULLIF
• ROUND
• GREATEST
• DLOG10

It also adds a PI() function, and GREATEST function stub.

Additionally, IS NOT NULL expression push down has been fixed.

Finally, LOG template generator is extended for a few drivers.

Related tests are included.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (b25c199) 47.12% compared to head (67dad87) 71.21%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
...bejs-schema-compiler/src/adapter/SnowflakeQuery.js	0.00%	2 Missing ⚠️
...ubejs-schema-compiler/src/adapter/BigqueryQuery.js	0.00%	1 Missing ⚠️
rust/cubesql/cubesql/src/compile/mod.rs	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #7406       +/-   ##
===========================================
+ Coverage   47.12%   71.21%   +24.08%     
===========================================
  Files         155      327      +172     
  Lines       20832    54345    +33513     
  Branches     5362     5362               
===========================================
+ Hits         9818    38701    +28883     
- Misses      10166    14796     +4630     
  Partials      848      848               

Flag	Coverage Δ
cube-backend	47.04% <0.00%> (-0.09%)	⬇️
cubesql	86.23% <88.88%> (?)

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