[Backport 2.x] #639: allow metadata fields and score opensearch function (#228)

[opensearch-trigger-bot]

Backport e805151 from #1456

[codecov-commenter]

Codecov Report

Merging #1508 (6016eee) into 2.x (89717e3) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##                2.x    #1508      +/-   ##
============================================
+ Coverage     98.47%   98.49%   +0.01%     
- Complexity     3884     3926      +42     
============================================
  Files           347      347              
  Lines          9646     9768     +122     
  Branches        625      645      +20     
============================================
+ Hits           9499     9621     +122     
  Misses          142      142              
  Partials          5        5              

Flag	Coverage Δ
sql-engine	98.49% <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)
...rg/opensearch/sql/analysis/ExpressionAnalyzer.java	100.00% <100.00%> (ø)
...rch/sql/analysis/ExpressionReferenceOptimizer.java	100.00% <100.00%> (ø)
...a/org/opensearch/sql/analysis/TypeEnvironment.java	100.00% <100.00%> (ø)
...c/main/java/org/opensearch/sql/expression/DSL.java	100.00% <100.00%> (ø)
...h/sql/expression/function/BuiltinFunctionName.java	100.00% <100.00%> (ø)
...h/sql/expression/function/OpenSearchFunctions.java	100.00% <100.00%> (ø)
...rc/main/java/org/opensearch/sql/storage/Table.java	100.00% <100.00%> (ø)
...sql/opensearch/request/OpenSearchQueryRequest.java	100.00% <100.00%> (ø)
...l/opensearch/request/OpenSearchRequestBuilder.java	100.00% <100.00%> (ø)
... and 7 more

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