rpc/stream/vc: rename err for vom type encoder/decoder
rpc/stream/vc: rename err for vom type encoder/decoder

   * rename from typed encoder/decoder to type encoder/decoder

Change-Id: I47f1e3914d46aa8d1c83d82aa0bc6532c95b7b98

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref