Allow folding switch_default

[Ben3eeE]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

case statements in javascript are parsed as:
switch_statement > switch_body >switch_case

Default case statements in javascript are parsed as:
switch_statement >switch_body > switch_default

This PR adds switch_default to the folding rules so default can be folded with the same rule as case.

Alternate Designs

N/A

Benefits

Consistent folding rules for switch statements

Possible Drawbacks

Someone likes unfoldable default and will open an issue that they can now fold it

Applicable Issues

N/A

Verification Process

const fun = () => {
  switch (variable) {
    case DO_STUFF:
      do_stuff();
      break;
    case DO_OTHER_STUFF:
      do_other_stuff();
      test();
      break;
    default:
      do_stuff();
      test();
      break;
  }
};

• Can not fold the default before this change
• Can fold the default after this change
• Run editor:log-cursor-syntax-tree-scope in the default and the switch to verify that they are parsed differently

[nathansobo]

❤️ This will be nice.