feat(csharp): add iggy error status codes

[lukaszzborek]

• add IggyErrorCode enum definition
• change IggyInvalidStatusCodeException to contains IggyErrorCode
• add tool to generate enum values from rust error file

[numinnex]

Hi, I've looked through the PR and I really like the idea, but there is one problem tho...

Currently IggyError isn't versioned (e.g it's not an separate crate that adheres to any sane versioning standards), which means that we might change it as we wish (move/remove it, etc..), which means that on an arbitrary release (non major one), we could potentially break the C# SDK.

Since the idea is great, I would like to archive this PR and revisit it once we figure out how to extract our error into an dedicated crate, that we can version independently.

Created #2524 to address that problem.

[lukaszzborek]

yep, it might be good idea for hold on it to time where will be separate crate for IggyError. It can be a bit confusing where error code will change in server.

We can also think about some CI checks for thats