Fix enum.max/min when enum in other contract

[smonicas]

Fix #2020 #1602
In slithir it will look as if the enum used is always the local one however the correct enum is used, that's because Enum str prints only the name it could be fixed by printing the canonical_name but then even when the enum is local you would have the contract name.
Slithir of the test:

	Function D.a() (*)
		Expression: uint256(type()(E).max)
		IRs:
			TMP_0(type(E)) = SOLIDITY_CALL type()(E)
			TMP_1(uint256) := 2(uint256)
			TMP_2 = CONVERT TMP_1 to uint256
			RETURN TMP_2
	Function D.b() (*)
		Expression: uint256(type()(Q.E).max)
		IRs:
			TMP_3(type(E)) = SOLIDITY_CALL type()(E)
			TMP_4(uint256) := 0(uint256)
			TMP_5 = CONVERT TMP_4 to uint256
			RETURN TMP_5
	Function D.c() (*)
		Expression: uint256(type()(Z.E).max)
		IRs:
			TMP_6(type(E)) = SOLIDITY_CALL type()(E)
			TMP_7(uint256) := 1(uint256)
			TMP_8 = CONVERT TMP_7 to uint256
			RETURN TMP_8

[0xalpharush]

Can this be expression.member_name instead of str(expression)?

[smonicas]

expression.member_name has only the enum name e.g. with C.E it's E but the fully qualified name is needed and that's the expression

[0xalpharush]

Can we make this an IR test that checks the value of the constant (min/max) instead of a parsing test?