[core] add commit.force-expire option

[zhoulii]

Purpose

Linked issue: close #2967

Sort compact only supports write-only mode, during which expiration operations are not performed. When users write data in write-only mode and use sort compact for sorting and merging, expired deletion cannot be executed. This PR add an option to force expiration.

[zhoulii]

Hi @Aitozi , could you please take a look at this PR? Thanks.