Add IBM Watson IoT Platform component

[mtreinish]

Description:

This commit adds a new history component for the IBM Watson IoT
Platform. The IBM Watson IoT Platform allows for tracking of devices
and analytics on top of the device data. This new component allows
users to have home assistant automatically populate a watson iot
platform board with device data from devices managed by home assistant.

Related issue (if applicable): fixes #

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#5100

Example entry for configuration.yaml (if applicable):

watson_iot:
  organization: 'organization_id'
  type: 'device_type'
  id: 'device_id'
  token: 'auth_token'

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.io

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

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.