Add config flow to OpenEVSE component

[firstof9]

Proposed change

Add config flow to OpenEVSE component and allow username and password authentication.

Type of change

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

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: n/a
• Link to documentation pull request: Update OpenEVSE for config flow instructions home-assistant.io#19101

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 user exposed functionality or configuration variables are added/changed:

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

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:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

To help with the load of incoming pull requests:

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

[milanmeu]

100% coverage is required for the config_flow.

Line 152 was not covered by tests:
https://github.com/home-assistant/core/pull/55303/checks?check_run_id=3445045908

[milanmeu]

Test the strings.json changes with:

python3 -m script.translations develop

You can add the generated translations/en.json to the PR.

[firstof9]

Thank you for your helpful reviews.

[firstof9]

@milanmeu any more suggestions or is this looking good now?

[drobtravels]

Any steps remaining in this PR? I just got installed OpenEVSE and was looking at improving the integration. Happy to help out.

[firstof9]

Seems the PR's stalled out, I've been tinkering on a custom integration now.

[github-actions]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days.
Thank you for your contributions.