Add mutation command APPLY DELETED MASK

[CurtizJ]

Changelog category (leave one):

• New Feature

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Added a new mutation command ALTER TABLE <table> APPLY DELETED MASK, which allows to enforce applying of mask written by lightweight delete and to remove rows marked as deleted from disk.

Part of #56728.

[robot-ch-test-poll4]

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[davenger]

@CurtizJ could you please give an example scenario with WHERE clause?
Looks like it is not covered by tests.

[CurtizJ]

@davenger
I removed this case because it appeared to be pointless. I'll update the changelog entry.

[davenger]

Can command.predicate be non-empty if we do not support WHERE clause? If no, then we should throw an error instead of 'and'

[davenger]

Please see one comment. Otherwise LGTM. Also Doc check suggests that the new command needs to be documented.