support inlay hints inside functions

remake of #759

Co-authored-by: ryuukk <ryuukk.dev@gmail.com>

dsymbol/src/dsymbol/conversion/package.d

@@ -115,6 +115,7 @@ class AutocompleteParser : Parser
 	{
 		if (!currentIs(tok!"{"))
 			return null;
+		if (cursorPosition == -1) return super.parseBlockStatement();
 		if (current.index > cursorPosition)
 		{
 			BlockStatement bs = allocator.make!(BlockStatement);

tests/tc_inlay_hints/expected.txt

@@ -1 +1,2 @@
 l	->Point	208
+l	->Point	247