Extend hcl2 support with more functions

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/zclconf/go-cty/cty/set/rules.go

@@ -22,6 +22,10 @@ type Rules interface {
 	// though it is *not* required that two values with the same hash value
 	// be equivalent.
 	Equivalent(interface{}, interface{}) bool
+
+	// SameRules returns true if the instance is equivalent to another Rules
+	// instance.
+	SameRules(Rules) bool
 }
 
 // OrderedRules is an extension of Rules that can apply a partial order to