Implement Equinix Metal LoadBalancer support

[displague]

What problem are you facing?

I want to interact with the BETA Load Balancer services via Metal CLI. https://deploy.equinix.com/developers/docs/metal/networking/load-balancers/

How could the Equinix Metal CLI help solve this problem?

Implement it.

Adds support for the BETA loadbalancer service: https://deploy.equinix.com/developers/docs/metal/networking/load-balancers/

https://github.com/equinix/lbaas-api-docs

Used Project as the base. Lots of cleanup ahead.

TODO:

• [x] Get LB
• [x] List LB
• [x] Detele LB
• [ ] Update LB
• [x] Create Project LB
  • [ ] Get Pool
  • [ ] List Pools
  • [ ] Delete Pool
  • [ ] Update Pool
  • [ ] Create Project Pool
  • [ ] Get Origin
  • [ ] List Origins
  • [ ] Delete Origin
  • [ ] Update Origin
  • [ ] Create Pool Origin
  • [ ] Get LB Port
  • [ ] List LB Ports
  • [ ] Delete LB Port
  • [ ] Update LB Port
  • [ ] Create LB Port
• [ ] Send debug transport to token exchange when debugging?
• [ ] Ensure command docs are correct
• [ ] Ensure requirement checks are correct
• [ ] Ensure example commands are correct
• [ ] Ensure command is named "loadbalancer-beta"
• [ ] generate docs

[displague]

This work would benefit from a published Equinix Metal LoadBalancer SDK for Go.

The one that was included in #454 is autogenerated and has been kept in internal/ to prevent reuse and dependency. A result of this is that it bulks up the metal-cli project.