Enable PPL lang and add datasource to async query API

[vmmusings]

Description

• Added PPL lang to Async Query API.
• Added datasource to request model.
• Removed table and schema tags in non Index Queries.
• Updated Spark Grammar For Indices.

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #2187 (eb0aabe) into main (ae10857) will decrease coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is 77.77%.

@@             Coverage Diff              @@
##               main    #2187      +/-   ##
============================================
- Coverage     96.56%   96.55%   -0.02%     
+ Complexity     4717     4715       -2     
============================================
  Files           436      436              
  Lines         12535    12526       -9     
  Branches        858      856       -2     
============================================
- Hits          12105    12094      -11     
- Misses          420      422       +2     
  Partials         10       10              

Flag	Coverage Δ
sql-engine	96.55% <77.77%> (-0.02%)	⬇️

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Files	Coverage Δ
...park/asyncquery/AsyncQueryExecutorServiceImpl.java	100.00% <100.00%> (ø)
...rch/sql/spark/dispatcher/SparkQueryDispatcher.java	100.00% <100.00%> (ø)
.../sql/spark/rest/model/CreateAsyncQueryRequest.java	22.72% <45.45%> (+22.72%)	⬆️