add feature tracking for cbor protocol

[lucix-aws]

Add feature metrics tracking for CBOR clients. Not actually used by any service right now, but you can see the codegen results in the cbor protocol test.

[lucix-aws]

We're missing a changelog (should we add automation to check this?)

I left a changelog out because it doesn't actually have any effect on released source. A changelog at the root module here would have just meant a new root module => service module churn because everything has to update to pull it in.

[Madrigal]

Only comment that we'll discuss

I left a changelog out because it doesn't actually have any effect on released source. A changelog at the root module here would have just meant a new root module => service module churn because everything has to update to pull it in.

I don't think our automation can handle a no changelog change IIRC