Enable multi table synthesizers to use new Metadata

[amontanez24]

Problem Description

As a user, I'd like to be able to use my metadata wherever it is applicable once created without having to do extra work.

Expected behavior

Once #2104 is complete, we need to enable multi table synthesizers to work with the new Metadata

• Support the new class on initialization
• Deprecate MultiTableMetadata
  • Raise a future warning if users use this
• They should be backwards compatible (still support the old class)

Additional context

Since the new class will be almost identical to the current MultiTableMetadata class, this should be a straightforward fix.

[gsheni]

Completed:
#2146

[amontanez24]

This will be closed when #2186 is merged