Make parse error suggestions verbose and fix spans

Go over all structured parser suggestions and make them verbose style.

When suggesting to add or remove delimiters, turn them into multiple suggestion parts.

Author: estebank

compiler/rustc_parse/messages.ftl

@@ -1,7 +1,7 @@
 parse_add_paren = try adding parentheses
 
 parse_ambiguous_range_pattern = the range pattern here has ambiguous interpretation
-    .suggestion = add parentheses to clarify the precedence
+parse_ambiguous_range_pattern_suggestion = add parentheses to clarify the precedence
 
 parse_array_brackets_instead_of_braces = this is a block expression, not an array
     .suggestion = to make an array, use square brackets instead of curly braces
@@ -644,7 +644,7 @@ parse_parentheses_with_struct_fields = invalid `struct` delimiters or `fn` call
     .suggestion_no_fields_for_fn = if `{$type}` is a function, use the arguments directly
 
 parse_parenthesized_lifetime = parenthesized lifetime bounds are not supported
-    .suggestion = remove the parentheses
+parse_parenthesized_lifetime_suggestion = remove the parentheses
 
 parse_path_single_colon = path separator must be a double colon
     .suggestion = use a double colon instead