feat: BETA loadbalancer service support

[displague]

Part of https://github.com/equinix/metal-cli/issues/411

(Used CPEM's LBaaS Go project as the base. Lots of cleanup ahead. )

This PR introduces the minimal subcommand support to start working with LoadBalancers. This PR does not include ports and pools, which can be added later.

TODO:

• [x] Get LB
• [x] List LB
• [x] Detele LB
• [x] Create Project LB
• [x] Send debug transport to token exchange when debugging?
• [x] Ensure command docs are correct
• [ ] Ensure requirement checks (required fields) are correct
• [x] Ensure example commands are correct
• [x] Ensure command is named "loadbalancer-beta"
• [x] generate docs

[ctreatma]

One thing to consider here: if LBaaS has its own generated client that sits next to the metal client in equinix-sdk-go, with its own spec and its own API endpoint, that may indicate that LBaaS CLI commands should go alongside Metal CLI commands in a broader-scoped Equinix CLI (eqx? eqix? the-equinix-cli?) rather than directly in here.

[cprivitere]

Merged in latest updates and tested create/get/delete commands to verify they work.