Add Epic Games Store integration

[Quentame]

trafficstars

Proposed change

This PR adds 2 Epic Games Store calendars, for free and discount games.

It squashes 62 commits from Hacktoberfest 2022 old PR #81167, and took care of @joostlek, @nachonam and @epenet reviews.

I may eventually add price tracking for specific games in the future.

Screenshot:

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New integration (thank you!)
• [ ] New feature (which adds functionality to an existing integration)
• [ ] Deprecation (breaking change to happen in the future)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [ ] Code quality improvements to existing code or addition of tests

Additional information

• Link to brand pull request: https://github.com/home-assistant/brands/pull/3820
• Link to documentation pull request: https://github.com/home-assistant/home-assistant.io/pull/24798

Checklist

• [x] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
• [x] There is no commented out code in this PR.
• [x] I have followed the development checklist
• [x] I have followed the perfect PR recommendations
• [x] The code has been formatted using Ruff (ruff format homeassistant tests)
• [x] Tests have been added to verify that the new code works.

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

• [x] Documentation added/updated for www.home-assistant.io

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

• [x] The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• [x] New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• [x] For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.
• [x] Untested files have been added to .coveragerc.

To help with the load of incoming pull requests:

• [x] I have reviewed two other open pull requests in this repository.

[Quentame]

@bramkragten: The new two-pane view from 2023.11 caused long label entity names not to be distinctive, not even a title or tooltip on mouse hover is present

One is a discount calendar, one is a free games calendar (mystery) 🔮

Compare to before 2023.11 in the PR description.

A possible solution could be using a shorter name as the integration page ?

Also a solution, on the two-pane calendar page, open the more info dialog when clicking on the entity icon ?

Thanks

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[bramkragten]

@bramkragten: The new two-pane view from 2023.11 caused long label entity names not to be distinctive, not even a title or tooltip on mouse hover is present

I guess a tooltip/hover makes sense there yeah

[Quentame]

OMG, it happened 🎉

Original PR #81167 was oppened on october 2022 (but OK, it's not directly a home related integration).

Thanks everyone 😘