Allow raw identifiers for SqlIdentifier (column-name)

This allows using the `r#identifier` syntax for SqlIdentifier
(column-name), which is used in derive macros.
Previously the derive macros would panic when encountering such an
identifier:
    `"r#identifier"` is not a valid identifier

.typos.toml

@@ -20,7 +20,9 @@ extend-ignore-re = [
     "cannot find value `titel` in module `posts`",
     "cannot find type `titel` in module `posts`",
     "[0-9]+[[:space]]+|[[:space:]]+titel: String",
-    "big_sur"
+    "big_sur",
+    # That's Spanish for "type" (used in a unit-test)
+    "tipe",
 ]
 
 [type.md]

diesel_derives/src/attrs.rs

@@ -75,7 +75,11 @@ impl SqlIdentifier {
 
 impl ToTokens for SqlIdentifier {
     fn to_tokens(&self, tokens: &mut TokenStream) {
-        Ident::new(&self.field_name, self.span).to_tokens(tokens)
+        if self.field_name.starts_with("r#") {
+            Ident::new_raw(&self.field_name[2..], self.span).to_tokens(tokens)
+        } else {
+            Ident::new(&self.field_name, self.span).to_tokens(tokens)
+        }
     }
 }