[Backport 2.7] #639: allow metadata fields and score opensearch function (#228)

[opensearch-trigger-bot]

Backport e805151 from #1456

[codecov-commenter]

Codecov Report

Merging #1509 (c539f07) into 2.7 (a796433) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##                2.7    #1509      +/-   ##
============================================
- Coverage     98.47%   98.41%   -0.06%     
+ Complexity     3884     3727     -157     
============================================
  Files           347      335      -12     
  Lines          9646     9281     -365     
  Branches        625      599      -26     
============================================
- Hits           9499     9134     -365     
  Misses          142      142              
  Partials          5        5              

Flag	Coverage Δ
sql-engine	98.41% <100.00%> (-0.06%)	⬇️

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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 6 more

... and 12 files with indirect coverage changes

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