Register declaration of enum field has a use (#22990)

Currently when using `use` with nimsuggest on an enum field, it doesn't
return the definition of the field.

Breaks renaming in IDEs since it will replace all the usages, but not
the declaration

(cherry picked from commit c31bbb0)

compiler/semtypes.nim

@@ -141,6 +141,7 @@ proc semEnum(c: PContext, n: PNode, prev: PType): PType =
     result.n.add symNode
     styleCheckDef(c, e)
     onDef(e.info, e)
+    suggestSym(c.graph, e.info, e, c.graph.usageSym)
     if sfGenSym notin e.flags:
       if not isPure:
         addInterfaceOverloadableSymAt(c, c.currentScope, e)

nimsuggest/tests/tuse_enum.nim

@@ -0,0 +1,15 @@
+discard """
+$nimsuggest --tester $file
+>use $1
+def;;skEnumField;;tuse_enum.Colour.Red;;Colour;;$file;;10;;4;;"";;100
+use;;skEnumField;;tuse_enum.Colour.Red;;Colour;;$file;;14;;8;;"";;100
+"""
+
+type
+  Colour = enum
+    Red
+    Green
+    Blue
+
+discard #[!]#Red
+