Support `<script setup>` and SFC css var injection for Vue 2.7.0+ in `no-unsupported-features` rule

[danielwaltz]

What rule do you want to change?
no-unsupported-features

Does this change cause the rule to produce more or fewer warnings?
Fewer warnings, as <script setup> and CSS var injection are both supported features in Vue >=2.7.0

How will the change be implemented? (New option, new default behavior, etc.)?
I plan to update the rule to include <script setup> and CSS var injection as part of the >=2.7.0 version.

Please provide some example code that this change will affect:

<script setup>
</script>

What does the rule currently do for this code?
Displays an error/warning with a { version: '2.7.0' } rule option set

What will the rule do after it's changed?
Will pass with a { version: '2.7.0' } rule option set

Additional context