Allow for runtime methods interleave

[jacogr]

Last missing part of #4930, allowing for runtime to be specified in the typesBundle.

Tested with -

const api = await ApiPromise.create({
  provider: new WsProvider('wss://kusama-rpc.polkadot.io'),
  runtime: {
    GrandpaApi: [
      {
        methods: {
          test: {
            description: 'Get current GRANDPA authority set id.',
            params: [],
            type: 'SetId'
          }
        },
        version: 3
      }
    ]
  },
  typesBundle: {
    spec: {
      kusama: {
        runtime: {
          GrandpaApi: [
            {
              methods: {
                current_set_id: {
                  description: 'Get current GRANDPA authority set id.',
                  params: [
                    {
                      name: 'foo',
                      type: 'bool'
                    },
                    {
                      name: 'bar',
                      type: 'bool'
                    }
                  ],
                  type: 'SetId'
                }
              },
              version: 3
            }
          ]
        }
      }
    }
  }
});

The above allows for an additional GranpaApi_test and changes GrandpaApi_current_set_id to take 2 arguments.

[polkadot-js-bot]

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