Add messages to assert statements

[heueristik]

Context

assertEq, assertLt, ... allow to add a message string.

Scope

Add messages to all asserts as done, for example, here:

evm-protocol-adapter/contracts/test/state/CommitmentTree.t.sol

Lines 29 to 40 in 7103fac

	function test_constructor_initializes_the_tree_with_depth_0() public {
	assertEq(new CommitmentTree().commitmentTreeDepth(), 0, "The initial tree depth should be 0.");
	}
	function test_constructor_initializes_the_tree_with_capacity_1() public {
	assertEq(new CommitmentTree().commitmentTreeCapacity(), 1, "The initial tree capacity should be 1.");
	}
	function test_constructor_initializes_the_tree_with_0_leaves() public {
	assertEq(new CommitmentTree().commitmentCount(), 0, "The initial commitment count should be 0.");
	}