Use terraform-plugin-framework-timetypes for RFC3339 string attributes

[bflad]

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Reference: https://pkg.go.dev/github.com/hashicorp/terraform-plugin-framework-timetypes/timetypes

Will submit a feature request upstream for time.Time to/from implementations to remove more of the boilerplate string <-> time.Time conversions and error handling.

[bflad]

should we add a changelog entry for this PR? Switching to this type internally introduces semantic equality logic that wasn't previously here

Since there's no backing API for these resources that could potentially change the formatting of the value, I'm not sure if there's a way for the semantic equality logic to have any effect in that sense.

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