Implement missing entrypoints

[mem]

• /api/v1/register/install
• /api/v1/check/add
• /api/v1/check/update
• /api/v1/check/delete/:id:
• /api/v1/check/list
• /api/v1/probe/add
• /api/v1/probe/update
• /api/v1/probe/list
• /api/v1/probe/delete/:id:
• /api/v1/tenant/update
• /api/v1/tenant/delete/:id:

Deprecated, removed:

• /api/v1/register/init
• /api/v1/register/save
• /api/v1/register/viewer-token
• /api/v1/register/describe