Add typings to OVO Energy integration

[timmo001]

Proposed change

Adds missing typings to OVO Energy integration.

Type of change

• Code quality improvements to existing code or addition of tests

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

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

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

The integration reached or maintains the following Integration Quality Scale:

• 🥈 Silver

To help with the load of incoming pull requests:

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

[epenet]

You will also need to adjust the tests accordingly, and possibly the string.json

[timmo001]

I don't see what that change did, so have reverted back. user_input can be None, so long as it is handled imo

[epenet]

I don't see what that change did, so have reverted back. user_input can be None, so long as it is handled imo

The current implementation is buggy. It assumes that first call doesn't have any data, yet it does!
So the correct way to implement is to split into two steps. First step has the context data (never None) and confirm step can be None.

[epenet]

You have rebased multiple times but you are not adressing my review. The current implementation is still buggy.

[epenet]

See #75682 as an example for the correct way to implement reauth/reauth_confirm.

[frenck]

@timmo001 👋

There is a merge conflict, could you take a quick look?

Thanks! 👍

../Frenck