Revise issue templates

[lbordowitz]

We should review the two issue templates for Bug Reports and Enhancements to ensure that they are up-to-date and have an appropriate amount of detail. Ideally, issue templates should be brief, comprehensible, and uncomplicated, with the goal of lowering the friction of contributions.

[Yantrio]

Is this in the right repo? Shouldn't it be in opentofu/opentofu? or are we doing this for all repos?

[lbordowitz]

We're doing this for all repositories with supervised contributions. Although we may want to start with opentofu/opentofu.