update vsize when lsmt stack files if needed

[liulanzheng]

What this PR does / why we need it:

update vsize and rewrite header for lsmt rw layer with zero vsize, which means inherit the vsize of lower, when lstm stack files.
After this change, the result of lsmt committed files remain consistent with the previous version.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[BigVan]

LGTM