fix: handle raw identifier struct field

[ymgyt]

Error

    #[derive(Builder, PartialEq, Debug)]
    pub struct RawIdentifier {
        id: String,
        r#type: String,
    }

error: proc-macro derive panicked
  --> safe-builder/tests/all/mod.rs:45:14
   |
45 |     #[derive(Builder, PartialEq, Debug)]
   |              ^^^^^^^
   |
   = help: message: `"R#typeType"` is not a valid identifier

What does this change?

• unraw struct field raw identifier before format

What can I check for bug fixes?

• add minimum test case

Note

• related issue Support reserved keywords for rename and fields raiden-dynamo#96
  • https://github.com/raiden-rs/raiden-dynamo/blob/35379297976a60e475baf1e552c27b9a9796b87d/raiden-derive/src/ops/put.rs#L100

[bokuweb]

LGTM