Provide a tool for rebuild a specify table in TiFlash side

[JaySon-Huang]

If the schema of a table in the TiFlash side gets broken for some reason, there could be a less costly approach for rebuilding that table:

1. Apply alter table <table_name> set tiflash replica 0 on TiDB and wait till all regions of that table get removed from TiFlash
2. Use drop table db_<db_id>.t_<table_id> through TiFlash HTTP API to drop that table in TiFlash side
3. Trigger the sync schema through TiFlash HTTP API to fetch and rebuild that table schema
4. Apply alter table <table_name> set tiflash replica <num> on TiDB to rebuild TiFlash regions data