DRILL-6715: Update descriptions for System Options table
With introduction of DRILL-5735 , the descriptions for about half the system options still remain missing. This commit collects descriptions review by @bbevens
1. Update options for HashAgg/Join (@Ben-Zvi )
2. Update options for Parquet Reader/Writer (@sachouche )
3. Update options for Planners (@HanumathRao , @vdiravka , @KazydubB )
4. Update options for BatchSizing (@bitblender )
5. Update options for Planner Optimizations (@arina-ielchiieva )
6. Update options for Security & Kafka (Krystal Nguyen)
7. Update options for Misc entries (@arina-ielchiieva , @vvysotskyi )
In additional, there is a patch for `org.apache.drill.exec.compile.ClassTransformer.scalar_replacement` , which appears to have replaced `exec.compile.scalar_replacement`. References to the latter have been removed to avoid confusion.
Additional changes include moving the `ClassTransformer` validator to `ExecConstants.java`
Adding support for internal options' descriptions
Removed mention of {{Will be removed in 1.15.0}}. (Refer DRILL-6527)
