[test] Add TSM related unit tests to improve code coverage.

[liikeuforever]

Required checklist

• Sample config files updated (config,meta/config and default config)
• If there are user-facing changes, the documentation needs to be updated prior to approving the PR( Link )
• If there are any breaking changes to public APIs, please add the api change label.
• Signed CLA (if not already signed)

Which issue does this PR close?

fix: series_data.add_column modifies the schema in groups, but series_data.drop_column also removes the corresponding column from rowdata.fields in groups. If we add a column in the schema update, but remove it without updating the value in the fields, it will be out of bounds.
tskv/src/memcache.rs 314-317.

unit tests:

memcache:
series_data_write_group()
series_data_columns_modify()
series_delete_by_time_ranges()
memcache_write_group()
memcache_to_chunk_group()
memcache_columns_modify()
memcache_read_series_data()
memcache_delete_by_time_ranges()

writers:
write_and_read()
write_and_read2()
write_and_read3()

data_block:
datablock_to_pages()
datablock_merge()
datablock_sort()
datablock_chunk()
datablock_fliter_by_tomb()

flush:
flush_run()

Related #.

Rationale for this change

Are there any user-facing changes?