Refactor homeassistant.util.slugify to homeassistant.util.string.slugify

[marvin-w]

Proposed change

Currently, the __init__ of the util module has third party dependencies, thus we can not move the Platform StrEnum to homeassistant.const due to dependency errors during setup.

Original Platform PR: #60857
Revert Platform PR with error message: #60875

Note: This has to be repeated for:

• homeassistant.util.Throttle - uses the dt module that also has 3rd party deps
• homeassistant.util.repr_helper - uses the dt module that also has 3rd party deps

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[balloob]

Although I applaud this change, I think that the impact is too big on custom components and we can't make this change without being backwards compatible.

A quicker approach for StrEnum is to move that from util to a new homeassistant.backports

[marvin-w]

Although I applaud this change, I think that the impact is too big on custom components and we can't make this change without being backwards compatible.

A quicker approach for StrEnum is to move that from util to a new homeassistant.backports

Good point. I like your idea - I'll close this then. Should I open another PR for the move to homeassistant.backports?