feat:added api command to support a GET request against any octopus api endpoint

[benPearce1]

Adds a new command: api

Will allow supporting OIDC login via the login command to access any endpoint URL from either Github or Octopus task.
Only supports GET at the moment, can easily be expanded to support POST/PUT later

> octopus api /api/spaces/Spaces-1/tenants/Tenants-1

{
  "Id": "Tenants-1",
  "Name": "eyore",
  "TenantTags": [
    "tags/all"
  ],
  "CustomFields": [],
  "ProjectEnvironments": {
    "Projects-21": [
      "Environments-2"
    ]
  },
  "SpaceId": "Spaces-1",
  "ClonedFromTenantId": null,
  "Description": "",
  "Slug": "eyore",
  "IsDisabled": false,
  "Icon": null,
  "Links": {
    "Self": "/api/Spaces-1/tenants/Tenants-1",
    "Variables": "/api/Spaces-1/tenants/Tenants-1/variables",
    "Web": "/app#/Spaces-1/tenants/Tenants-1",
    "Logo": "/api/Spaces-1/tenants/Tenants-1/logo?cb=0.0.0-local"
  }
}

> octopus api /api/spaces/Spaces-1/tenants/Tenants-1 | jq -r '.Name'
eyore

error handling:

> octopus api /api/spaces/Spaces-1/tenants/Tenants-11
{
  "ErrorMessage": "Resource is not found or it doesn't exist in the current space context. Please contact your administrator for more information."

> echo $? 
1