support basic.get

[lenkan]

basic.get is the only AMQP method that can have two different response methods. The codegen currently does not handle this well, especially since basic.get-ok carries content and basic.get-empty does not. See:

• deno-amqp/src/amqp_protocol.ts

  Line 323 in 9ccfb6e

  async sendBasicGet(

• deno-amqp/src/codegen/generate_protocol.ts

  Line 60 in 9ccfb6e

  } else if (method.synchronous && responses.length > 1) {

If get should be exposed on AmqpChannel it needs to support both get-empty and get-ok appropriately.