Add the code related to richer error model support to a new
`richer_error` module. This improves readability and hopefully will
make it easier to add new features to `tonic-types` in the future.
* types: add tonic as dependency, add error_details.proto
* types: add BadRequest support from flemosr/tonic-richer-error
* types: adjust code following suggestions
Adjustments following suggestions by @LucioFranco in https://github.com/hyperium/tonic/pull/1068.
Adjust style, remove unecessary prints, avoid glob imports, apply
`non_exhaustive` to `ErrorDetails` and `ErrorDetail`, avoid pub
fields in `ErrorDetails`, adjust
`WithErrorDetails::with_error_details_vec` args, add
`gen_details_bytes`.
* types: add generated protobuf code
As suggested by @LucioFranco in https://github.com/hyperium/tonic/pull/1068#discussion_r956117520.
This avoids the need for consumers to have `protoc` in their path.
Implemented following changes in https://github.com/hyperium/tonic/pull/1065.
* types: add custom metadata support
This allows consumers to provide custom metadata when creating a
`Status` with error details.
* types: adjust code following suggestions
Adjustments following suggestions by @LucioFranco in https://github.com/hyperium/tonic/pull/1068.
Move `error_details_vec` mod into `error_details` mod, adjust doc
comments, rename `WithErrorDetails` trait to `StatusExt`.
