Delete client and handler stream constructors

[akshayjshah]

These aren't used in the generated code anymore, so we don't need to
export them. They don't do much work either, so we can just delete the
constructors and use a linter to make sure we always initialize future
fields.

[bufdev]

Just want to look over this again tomorrow, will check before EOD

[bufdev]

Can we add godoc comments to each of the *ForClient structs that they should only be created by the connect package? All other public structs other than Specification have constructors, and it's worth calling out why the *ForClient structs are special (and I'd argue that Specification is special as well compared to other public structs, but no need to comment on it).

const StreamTypeUnary StreamType = 0b00 ...
const IsAtLeastVersion0_0_1 = true
const Version = "0.0.1"
func DecodeBinaryHeader(data string) ([]byte, error)
func EncodeBinaryHeader(data []byte) string
type AnyRequest interface{ ... }
type AnyResponse interface{ ... }
type BidiStream[Req, Res any] struct{ ... }
    func NewBidiStream[Req, Res any](s Sender, r Receiver) *BidiStream[Req, Res]
type BidiStreamForClient[Req, Res any] struct{ ... }
    func NewBidiStreamForClient[Req, Res any](s Sender, r Receiver) *BidiStreamForClient[Req, Res]
type Client[Req, Res any] struct{ ... }
    func NewClient[Req, Res any](httpClient HTTPClient, url string, options ...ClientOption) (*Client[Req, Res], error)
type ClientOption interface{ ... }
    func WithClientOptions(options ...ClientOption) ClientOption
    func WithGRPC() ClientOption
    func WithGRPCWeb() ClientOption
    func WithGzipRequests() ClientOption
    func WithRequestCompression(name string) ClientOption
type ClientStream[Req, Res any] struct{ ... }
    func NewClientStream[Req, Res any](s Sender, r Receiver) *ClientStream[Req, Res]
type ClientStreamForClient[Req, Res any] struct{ ... }
    func NewClientStreamForClient[Req, Res any](s Sender, r Receiver) *ClientStreamForClient[Req, Res]
type Code uint32
    const CodeCanceled Code = 1 ...
    func CodeOf(err error) Code
type Codec interface{ ... }
type Compressor interface{ ... }
type Decompressor interface{ ... }
type Error struct{ ... }
    func NewError(c Code, underlying error) *Error
type ErrorDetail interface{ ... }
type HTTPClient interface{ ... }
type Handler struct{ ... }
    func NewBidiStreamHandler[Req, Res any](procedure string, ...) *Handler
    func NewClientStreamHandler[Req, Res any](procedure string, ...) *Handler
    func NewServerStreamHandler[Req, Res any](procedure string, ...) *Handler
    func NewUnaryHandler[Req, Res any](procedure string, ...) *Handler
type HandlerOption interface{ ... }
    func WithHandlerOptions(options ...HandlerOption) HandlerOption
type Interceptor interface{ ... }
type Option interface{ ... }
    func WithCodec(codec Codec) Option
    func WithCompressMinBytes(min int) Option
    func WithCompression(name string, newDecompressor func() Decompressor, ...) Option
    func WithGzip() Option
    func WithInterceptors(interceptors ...Interceptor) Option
    func WithOptions(options ...Option) Option
    func WithProtoBinaryCodec() Option
    func WithProtoJSONCodec() Option
type Receiver interface{ ... }
type Request[T any] struct{ ... }
    func NewRequest[T any](message *T) *Request[T]
type Response[T any] struct{ ... }
    func NewResponse[T any](message *T) *Response[T]
type Sender interface{ ... }
type ServerStream[Res any] struct{ ... }
    func NewServerStream[Res any](s Sender) *ServerStream[Res]
type ServerStreamForClient[Res any] struct{ ... }
    func NewServerStreamForClient[Res any](r Receiver) *ServerStreamForClient[Res]
type Specification struct{ ... }
type StreamType uint8
type UnaryFunc func(context.Context, AnyRequest) (AnyResponse, error)
type UnaryInterceptorFunc func(UnaryFunc) UnaryFunc

[akshayjshah]

Sure, can do.

[akshayjshah]

Added docs, squash or rebase this in if it looks good to you.