refactor: add type annotations to base_model_provider_handler

What does this merge request do and why?

Adds type annotations to BaseModelProviderHandler.

Addresses the following discussion !1839 (comment 2296506949)

Merge request checklist

• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.

changed milestone to %17.9

added devopscreate groupcode creation maintenancerefactor sectiondev typemaintenance labels

assigned to @ck3g

added Category:Code Suggestions label

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Reviewer	Maintainer
@mikeeddington (UTC-8, 9 hours behind author)	@alejandro (UTC+0, 1 hour behind author)

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Generated by Danger

@srayner @achueshev could you please review this change? Thank you

requested review from @achueshev and @srayner

resolved all threads

started a merge train

approved this merge request

merged

mentioned in commit 884ec8a1