[YSQL] Support CREATE_REPLICATION_SLOT command

[dr0pdb]

Jira Link: DB-8008

Description

Support creating logical replication slot via:

1. CREATE_REPLICATION_SLOT
2. pg_create_logical_replication_slot

Tasks:

• [CDCSDK] Support record_type Default and Nothing #19260
• [CDCSDK] Limit number of CDCSDK streams using max_replication_slots #19264

Unsupported features:

1. Temporary replication slot

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