feat: Support partial client updates

[mbonnell-wish]

Is your feature request related to a problem? Please describe.

Currently, the only client updates supported by the REST API are updates with PUT semantics, meaning the entire client gets replaced. This is undesirable when one only wants to update a certain property, like a callback URI.

This desire is referenced here and here.

Describe the solution you'd like

It would be good to also support partial client updates through a PATCH request. For the CLI, we could add some flag like --partial as suggested by @matheusfm.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've
considered.

Additional context

Would be happy to tackle this over the weekend.

[mattbonnell]

@aeneasr let me know if you'd be open to accepting a PR for this feature 😄
Would be a little bit of work so just want to get the green-light from you before I start on it.

[aeneasr]

Yes, that would be great! There's an open issue for discussing ideas how to do this here: ory/meta#2