[MSTP] CLI Support (sonic-net#3848)

What I did
Implemented CLI utilities for MSTP (Multiple Spanning Tree Protocol) in SONiC
How I did it
Introduced new configuration and show commands to manage MSTP at the global, region, instance, and interface levels.
Updated the configuration database schema to support MSTP, including new tables and additions to the existing STP_GLOBAL_TABLE.

Author: wajahatrazi