Add multi contracts support for Hydroquebec

[titilambert]

Description:

This update adds the support of hydroquebec accounts with multiple contracts.
Now, we have to add the contract id when using this component.

This is a configuration breaking change from v0.39.x and earlier

Related issue (if applicable): fixes #5408

Pull request in home-assistant.github.io with documentation (if applicable): home-assistant/home-assistant.io#2191

Example entry for configuration.yaml (if applicable):

sensor:
  - platform: hydroquebec
    username: MYUSERNAME
    password: MYPASSWORD
    contract: 123456789
    monitored_variables:
     - period_total_bill
     - period_length
     - period_total_days
     - period_mean_daily_bill
     - period_mean_daily_consumption
     - period_total_consumption
     - period_lower_price_consumption
     - period_higher_price_consumption
     - yesterday_total_consumption
     - yesterday_lower_price_consumption
     - yesterday_higher_price_consumption

Checklist:

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

• Documentation added/updated in home-assistant.github.io
• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• 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.

[mention-bot]

@titilambert, thanks for your PR! By analyzing the history of the files in this pull request, we identified @kk7ds, @balloob and @fabaff to be potential reviewers.

[houndci-bot]

trailing whitespace

[pvizeli]

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