Prerequisites

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Proposal

Convert the sass variables $form-check-input-checked-bg-color and $form-check-input-checked-border-color to be css variables (e.g. --{$prefix}-form-check-input-checked-bg-color: and --{$prefix}-form-check-input-checked-border-color).

Motivation and context

It would be nice to theme these values without needing a custom SASS build.