Add Rust SDK

[dborovcanin]

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

No. I just want to be able to use API Magistrala with Rust client.

Describe the feature you are requesting, as well as the possible use case(s) for it.

The title is self-explanatory.

Indicate the importance of this feature to you.

Must-have

Anything else?

No response