Add received-bandwidth and originate-bandwidth CLI

[colintle]

Associated PR: https://github.com/sonic-net/sonic-buildimage/pull/19532 https://github.com/sonic-net/sonic-buildimage/pull/19663 https://github.com/sonic-net/sonic-buildimage/pull/19664 https://github.com/sonic-net/sonic-buildimage/pull/19662

What I did

• 'show bgp device-global' now works with multi-asic.
• I created a CLI to configure W-ECMP settings on receiver devices aka received-bandwidth.
• I created a CLI to configure W-ECMP settings to advertise bandwidth aka originate-bandwidth.

How I did it

• I modified existing code to now include more subcommands of "config bgp device-global w-ecmp".
• I modified the functionality for 'show bgp device-global'.
• The CLI uses FRR to modify router configuration: router bgp -> bgp bestpath bandwidth ...

How to verify it

• I wrote unit tests for this and tested it on a virtual testbed.
• I tested on virtual T2-chassis with multi-asic and wrote unit tests for it.
• I verified it by creating unit tests for it and testing it on virtual testbed T2 multi-asic.

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

Multi-Asic

Single-Asic

[rlhui]

can we be a little bit more specific in the title what's being added in this PR