Implement compose_cli client support for Tenant and global User management

[s4ke]

• Add support for Tenant diff and creation
• Add support for global User management (without diff though?) - in the same swoop we should probably also add support for managing users generally (tenant specific ones)?

[s4ke]

Before we decide on actually doing this with diffing, we have to be careful to not accidentally create a footgun that deletes tenants and users by accident.

Tenants are already guarded by their softdelete nature though. However there is no way to delete a tenant and then recreate it without admin intervention anyways.

This leads to at least an argument against full diff-logic being a good idea. Instead, we can expose libraries for fetching and creating, but not full automatic migrations similar to how we do it for DataPoints.