Propagate index DDL commands via workers

[hanefi]

DESCRIPTION: Adds support for running index ddl commands from workers

This is the first phase in adding support for running DDL commands from any node.

The following are supported:

• CREATE INDEX
• DROP INDEX
• REINDEX INDEX

ALTER INDEX commands are left out of scope for now.

TODO:

• [x] Add more isolation tests to cover concurrent ddl operations from different workers

[codecov[bot]]

Codecov Report

Merging #7009 (dde8e26) into main (1bb667c) will decrease coverage by 0.01%. The diff coverage is 97.36%.

:exclamation: Current head dde8e26 differs from pull request most recent head 8158816. Consider uploading reports for the commit 8158816 to get more accurate results

@@            Coverage Diff             @@
##             main    #7009      +/-   ##
==========================================
- Coverage   93.34%   93.34%   -0.01%     
==========================================
  Files         273      273              
  Lines       58479    58493      +14     
==========================================
+ Hits        54587    54598      +11     
- Misses       3892     3895       +3