[rust] Introduce SchemaId newtype to replace i32/i16 schema id passing
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- Dominant language
- Rust
- Stars
- 58
- Forks
- 50
- PR merge metrics
- No merged PRs in 30d
Description
### Search before asking
- [x] I searched in the [issues](https://github.com/apache/fluss-rust/issues) and found nothing similar.
### Description
Introduce a SchemaId(i16) newtype and cleanup
### Willingness to contribute
- [ ] I'm willing to submit a PR!
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