feat: dsql grammar and parser implementation

[manojpramesh]

Ref: https://github.com/DiceDB/dice/issues/1228

This is a draft implementation of dsql grammar using antlr4. Improves the performance of query executer and avoids retrofitted error handling.

This code can be further cleaned, but would wait for the initial review considering it is a total rewrite of how DSQL is handled

[JyotinderSingh]

This is a super interesting PR, I'll go through it soon.

[manojpramesh]

@JyotinderSingh Fixed the build issues and rebased with latest changes. Will wait for the initial review (no hurry) before adding more features considering it is a rewrite and the team may have different views.

[JyotinderSingh]

Thanks for providing this update Manoj. We have removed support for the Q.WATCH feature for now in the new multi-threaded server due to less community interest around it. Let's revisit this PR once we add back the support for this feature. I will keep this PR open.

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[arpitbbhayani]

this is obsolete now. Closing the PR to keep things clean. Thanks for working on the patch.