[Backport 2.x] Create datasource API (#1458)

[vmmusings]

Backport from #1458

#1458

[codecov-commenter]

Codecov Report

Merging #1479 (733d37e) into 2.x (20964e1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

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@@            Coverage Diff            @@
##                2.x    #1479   +/-   ##
=========================================
  Coverage     98.46%   98.46%           
- Complexity     3863     3867    +4     
=========================================
  Files           345      345           
  Lines          9594     9600    +6     
  Branches        615      616    +1     
=========================================
+ Hits           9447     9453    +6     
  Misses          142      142           
  Partials          5        5           

Flag	Coverage Δ
sql-engine	98.46% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...ain/java/org/opensearch/sql/analysis/Analyzer.java	100.00% <100.00%> (ø)
...alysis/DataSourceSchemaIdentifierNameResolver.java	100.00% <100.00%> (ø)
...ensearch/sql/datasource/DataSourceServiceImpl.java	100.00% <100.00%> (ø)
...l/prometheus/storage/PrometheusStorageFactory.java	100.00% <100.00%> (ø)

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