Drop Index Implementation

[vmmusings]

Description

• Add capabilities for drop Index Query.

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 #2204 (41d1301) into main (49ea48c) will decrease coverage by 0.21%.
Report is 1 commits behind head on main.
The diff coverage is 73.58%.

@@             Coverage Diff              @@
##               main    #2204      +/-   ##
============================================
- Coverage     96.57%   96.37%   -0.21%     
- Complexity     4712     4722      +10     
============================================
  Files           437      439       +2     
  Lines         12574    12650      +76     
  Branches        866      869       +3     
============================================
+ Hits          12143    12191      +48     
- Misses          422      450      +28     
  Partials          9        9              

Flag	Coverage Δ
sql-engine	96.37% <73.58%> (-0.21%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...park/asyncquery/AsyncQueryExecutorServiceImpl.java	100.00% <100.00%> (ø)
.../spark/asyncquery/model/AsyncQueryJobMetadata.java	88.88% <100.00%> (+3.70%)	⬆️
...rch/sql/spark/dispatcher/SparkQueryDispatcher.java	100.00% <100.00%> (ø)
.../org/opensearch/sql/spark/utils/SQLQueryUtils.java	100.00% <100.00%> (ø)
...org/opensearch/sql/spark/flint/FlintIndexType.java	92.85% <92.85%> (ø)
.../sql/spark/flint/FlintIndexMetadataReaderImpl.java	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes