refactor(rome_js_analyze): noFallthroughSwitchClause handle block statements

[Conaclos]

Summary

This PR fixes an issue with noFallthroughSwitchClause that reported code with block statements:

switch x {
  // this case was reported by the rule
   case 0: {
    f();
    break;
  }
  case 1:
    f();
}

Test Plan

New test included.

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[Conaclos]

The implementation should certainly use the control flow analyzer. For the mean time, it is a useful fix because some Rome rules require placing the statements of some switch clauses inside a block.