feat: initial implementation

api/model_time.go

api/model_wrappedref.go

deviceauth/config.go

deviceauth/model_authcodeoption.go

deviceauth/model_authstyle.go

deviceauth/model_deviceauth.go

deviceauth/model_duration.go

deviceauth/request_deviceauth.go

deviceauth/request_token.go

deviceauth/tokensource_deviceauth.go

deviceauth/tokensource_persisting.go

go.mod

go.sum

httputil/client.go

httputil/middleware.go

httputil/middleware_tokensource.go

httputil/middleware_tracing.go

util/filepersister.go

util/persister.go