Adds uk_transport component

[robmarkcole]

Description:

Adds uk_transport component which provides sensors for bus and train departure times.

**Pull request in home-assistant/home-assistant.io#3037

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: uk_transport
    app_id: !secret uk_transport_app_id
    app_key: !secret uk_transport_app_key
    queries:
      - mode: bus
        origin: 340000368SHE
        destination: Wantage
      - mode: train
        origin: MAL
        destination: WIM

Checklist:

If the code communicates with devices, web services, or third-party tools:

• [ x] Local tests with tox run successfully. Your PR cannot be merged unless tests pass

If the code does not interact with devices:

• [x ] Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• [x ] Tests have been added to verify that the new code works.

[lwis]

Nice work 👍

[lwis]

This can be merged once the lint is fixed.

[robmarkcole]

Hi @lwis had the same issue with #8272 by @balloob merged anyway without issue. Please advise. Cheers

[balloob]

@robmarkcole that's not true. For #8272 it was a flaky test on Python 3.6. If you look at the build results now, there is a linting error which needs to be addressed.

[robmarkcole]

@balloob you are correct, should be fixed now

[lwis]

Thanks! 🐊