Substrait serializer clippy error: not calling truncate

[alamb]

As part of #9725 we had to disable a newly added clippy lint to get CI to pass

However it looks like the clippy lint is flagging a potential real issue

          @waynexia please check this

I suppressed the warning but clippy requires .truncate to be called before file creation

  --> datafusion/substrait/src/serializer.rs:32:39
   |
32 |     let mut file = OpenOptions::new().create(true).write(true).open(path)?;
   |                                       ^^^^^^^^^^^^- help: add: `.truncate(true)`
   |
   = help: if you intend to overwrite an existing file entirely, call `.truncate(true)`
   = help: if you instead know that you may want to keep some parts of the old file, call `.truncate(false)`
   = help: alternatively, use `.append(true)` to append to the file instead of overwriting it
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_open_options
   = note: `-D clippy::suspicious-open-options` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::suspicious_open_options)]`

Originally posted by @comphead in #9725 (comment)

[alamb]

I added to the substrait support epic: #5173