Add Timer to Helpers

[danimart1991]

Proposed change

Add Timer to Helpers UI

Type of change

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

Example configuration

timer:

Additional information

• This PR fixes or closes issue: fixes Add timer to helper ui #4997
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• 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

[danimart1991]

This pull request also needs to update default_config entity to include timer.