fixes #18235 - proc annotation type macro sym leak (#18249)

* fixes #18235 - proc annotation type macro sym leak

- also fixed a typo
- proc annotations guard symbol exports with shadow scopes
- symbol handling is shadow scope aware

* test for exporting an existing unexported sym

this one is for my homie alaviss.

* Special handling not needed in semProcAnnotation

* Testcasing

* [skip ci]  clean-up and add some more comments

* [skip ci] rm trailing whitespace

Co-authored-by: Clyybber <darkmine956@gmail.com>

compiler/semstmts.nim

@@ -1844,7 +1844,7 @@ proc semProcAux(c: PContext, n: PNode, kind: TSymKind,
 
   # before compiling the proc params & body, set as current the scope
   # where the proc was declared
-  let delcarationScope = c.currentScope
+  let declarationScope = c.currentScope
   pushOwner(c, s)
   openScope(c)
 
@@ -1889,7 +1889,7 @@ proc semProcAux(c: PContext, n: PNode, kind: TSymKind,
 
   var (proto, comesFromShadowScope) =
       if isAnon: (nil, false)
-      else: searchForProc(c, delcarationScope, s)
+      else: searchForProc(c, declarationScope, s)
   if proto == nil and sfForward in s.flags:
     ## In cases such as a macro generating a proc with a gensymmed name we
     ## know `searchForProc` will not find it and sfForward will be set. In
@@ -1916,9 +1916,9 @@ proc semProcAux(c: PContext, n: PNode, kind: TSymKind,
 
   if not hasProto and sfGenSym notin s.flags: #and not isAnon:
     if s.kind in OverloadableSyms:
-      addInterfaceOverloadableSymAt(c, delcarationScope, s)
+      addInterfaceOverloadableSymAt(c, declarationScope, s)
     else:
-      addInterfaceDeclAt(c, delcarationScope, s)
+      addInterfaceDeclAt(c, declarationScope, s)
 
   pragmaCallable(c, s, n, validPragmas)
   if not hasProto: