[Feature] implement transpose command as in the roadmap opensearch-project#4786 (opensearch-project#5011)

* transpose command implementation

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* transpose rows to columns

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added argument type missing map and hashmap

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added tests

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added more validations

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added validation

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* index.md formatting fix

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* doc format

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* coderabbit review fixes

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added recommended changes

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added recommended changes

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* for cross cluster failure debugging

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* for cross cluster failure debugging

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* for cross cluster failure debugging

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* trim columnName

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* per review moved to class varialble.

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* per review moved to class varialble.

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* added field resolution

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* fix by removing metadata field

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

* fixed explain test after removing of metadata fields in transpose result

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

---------

Signed-off-by: Asif Bashar <asif.bashar@gmail.com>

Author: asifabashar

ppl/src/main/antlr/OpenSearchPPLLexer.g4

@@ -47,6 +47,7 @@ ML:                                 'ML';
 FILLNULL:                           'FILLNULL';
 FLATTEN:                            'FLATTEN';
 TRENDLINE:                          'TRENDLINE';
+TRANSPOSE:                          'TRANSPOSE';
 CHART:                              'CHART';
 TIMECHART:                          'TIMECHART';
 APPENDCOL:                          'APPENDCOL';