Allow hint and warning to specify its loc info (#8771)

Let's bring those to feature-parity with `error`.

tests/macros/tmsginfo.nim

@@ -0,0 +1,24 @@
+discard """
+  nimout: '''tmsginfo.nim(21, 1) Warning: foo1 [User]
+tmsginfo.nim(22, 11) template/generic instantiation from here
+tmsginfo.nim(15, 10) Warning: foo2 [User]
+tmsginfo.nim(23, 1) Hint: foo3 [User]
+tmsginfo.nim(19, 7) Hint: foo4 [User]
+'''
+"""
+
+import macros
+
+macro foo1(y: untyped): untyped =
+  warning("foo1", y)
+macro foo2(y: untyped): untyped =
+  warning("foo2")
+macro foo3(y: untyped): untyped =
+  hint("foo3", y)
+macro foo4(y: untyped): untyped =
+  hint("foo4")
+
+proc x1() {.foo1.} = discard
+proc x2() {.foo2.} = discard
+proc x3() {.foo3.} = discard
+proc x4() {.foo4.} = discard