Support legacy syntax for match_phrase in the new SQL engine.

[MaxKsyunz]

These changes have already been reviewed as part of #48.

Creating another PR to bring them into the integration branch.

Description

Add support for matchphrase as an alternative spelling of match_phrase.

Mention in both SQL and PPL documentation that matchphrase is accepted
as well as match_phrase.

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 #59 (d6ea633) into integ-match_phrase-#185 (a7d4395) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@                    Coverage Diff                     @@
##             integ-match_phrase-#185      #59   +/-   ##
==========================================================
  Coverage                      97.67%   97.67%           
  Complexity                      2743     2743           
==========================================================
  Files                            266      267    +1     
  Lines                           6797     6809   +12     
  Branches                         433      437    +4     
==========================================================
+ Hits                            6639     6651   +12     
  Misses                           157      157           
  Partials                           1        1           

Flag	Coverage Δ
sql-engine	97.67% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...arch/storage/script/filter/FilterQueryBuilder.java	100.00% <ø> (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)
...ript/filter/lucene/relevance/MatchPhraseQuery.java	100.00% <100.00%> (ø)

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