[C++ SDK] Create high level client from the generated bindings.

### Description

A high-level convenience wrapper library `iggy-cpp` needs to be created that the user can utilize.

### Component

None

### Proposed solution

- Implement classes for all shared structs in #2763, in addition to the already existing convenience classes from #2762.
- Create a RAII class for IggyClient.
- Create an example that showcases the public API.
- Write integration tests for each component.

### Alternatives considered

_No response_

sub-issue of #2100