[YSQL][DDL Atomicity - post GA] YSQL DDL Atomicity Part 10 - Two Phased Rollback of DROP TABLE/INDEX

[emhna]

Jira Link: DB-5297
Support 2 phased rollback feature on DROP TABLE/INDEX by first marking the table/index for deletion and prevent concurrent accesses to the table/index.
Once the DROP transaction commits, perform actual cleanup of the data in the table/index on the DocDB layer.
If the transaction fails, the delete marker is rolled-back.
This is child issue of YSQL DDL Atomicity #13358