grpc: move different type RPC handling out of underlying stream implementations (#9226)

This PR refactors and extracts stream-type-specific logic into a
dedicated interceptor and stream wrapper to simplify the underlying
stream transport implementations and also simplify these xDS http filter
implementations.

- Introduced `clientStreamWrapper`: Added a wrapper in `stream.go` that
intercepts `SendMsg`, `CloseSend`, and `RecvMsg`. It inspects the
`StreamDesc` to conditionally apply specific behaviors, like converting
`io.EOF` to nil on `SendMsg` for non-client-streaming RPCs, auto-calling
CloseSend, and checking for cardinality violations after receiving a
message in non-server-streaming RPCs.

- Added `defaultStreamInterceptor`: Created a default interceptor that
applies this wrapper to all client streams.

- Registered the Default Interceptor: Updated
`chainStreamClientInterceptors` in `clientconn.go` to prepend
`defaultStreamInterceptor` to the interceptor chain.

- Cleaned up `call.go` and internal streams: Removed the now-redundant
EOF checking, Recv calls and cardinality checks from the lower-level
transport functions in `stream.go`

RELEASE NOTES: None