* add scaffolding, and client authentication.

* return APITypeGlobal from GetAPIType function, as SFC accounts are not tied to specific regions.

* fix apiKey in SFCCredential struct

* scaffolding for instance.go

* add instance creation implementation with SSH key support

* add function to map the status of a node reported from SFC API to v1.LifecycleStatus in Brev

* implement GetInstance in sfcompute with node data retrieval inluding SSH Hostname / Public IP

* add TerminateInstance implementation with node release and delete logic

* set default SSH port to 2222, as is standard for our platform

* implement GetSSHHostname for retrieving the SSH hostname of an instance in sfcompute

* remove unneeded call to api for GetSSHHostname

* use VM ID instead of instance ID to retrieve SSH Hostname

* remove get ssh hostname function

* implement ListInstances

* add validation test for sfcompute with API key check and skip logic

* add getInstanceTypeID method for generating instance type IDs in sfcompute

* bump sfcnodes version to v0.1.0-alpha.4 which adds support for the /v0/zones endpoint

* implement GetLocations

* only return approved zones

* only return regions that have more than zero capacity instead of any zones that have capacity not equal to zero, in case the availability ever returns a negative number

* update location description to include formatted hardware type information. example: `sfc_hayesvalley_h100`

* return unavailable regions with v1.Location{Available: false}

* fix an error where a nil map was returned

* start implementing GetInstanceTypes

* fix tests failing due to ValidateRegionalInstanceTypes and ValidateStableInstanceTypeIDs fails errors

* set MaxPricePerNodePerHour to 1600 ($16/node/h, $2/gpu/h)

* add regions excelsior and yerba

* remove region excelsior