Add Support for Alternate Legacy MULTIMATCH syntax

[forestmvey]

Description

Add support for alternative syntax of MULTI_MATCH relevance search functions. Legacy engine supports parameter keys as quoted, or unquoted values for both required and optional arguments. This syntax has been ported over to all relevance functions in the V2 engine.

Example Queries

SELECT * FROM stackexchange_beer WHERE MULTI_MATCH('query'='cicerone', 'fields'='Tags');
SELECT * FROM stackexchange_beer WHERE MULTIMATCH('query'='cicerone', 'fields'='Tags');
SELECT * FROM stackexchange_beer WHERE MULTIMATCHQUERY('query'='cicerone', fields='Tags');
SELECT * FROM stackexchange_beer WHERE MULTIMATCHQUERY(query='cicerone', 'fields'=['Title,Tags^2.0']);

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.80%. Comparing base (43ceda1) to head (bf863a2).
⚠️ Report is 464 commits behind head on 2.x.

❌ Your project status has failed because the head coverage (95.80%) is below the target coverage (99.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1102      +/-   ##
============================================
- Coverage     98.30%   95.80%   -2.50%     
- Complexity     3470     3479       +9     
============================================
  Files           348      358      +10     
  Lines          8659     9347     +688     
  Branches        549      674     +125     
============================================
+ Hits           8512     8955     +443     
- Misses          142      334     +192     
- Partials          5       58      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.30% <100.00%> (+<0.01%)	⬆️

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[penghuo]

please helping update doc

[dai-chen]

Thanks for the changes!