Generate operationId from controller method name

[drmathias]

Generates and includes an operationId for each endpoint, based on the method name. The purpose of this is so that it is viable to code generate an API client, with unambiguous method names. Updated some of the controller method names to make it clearer what the endpoint does.

Example output:

"/api/command/send": {
  "post": {
    "tags": [
      "Command"
    ],
    "operationId": "sendTransaction",
    "requestBody": {
      "content": {
        "application/json-patch+json": {
          "schema": {
            "type": "string"
          }
        },
        "application/json": {
          "schema": {
            "type": "string"
          }
        },
        "text/json": {
          "schema": {
            "type": "string"
          }
        },
        "application/*+json": {
          "schema": {
            "type": "string"
          }
        }
      }
    },
    "responses": {
      "200": {
        "description": "Success"
      }
    }
  }
}

[dangershony]

@drmathias this PR seem to have been forgotten are you still keen to push this in ?