[metrics] Add error and retry tracking metrics
Open
- 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
To close gap with production alerting, we miss client side error / retry metrics in rust client.
### Willingness to contribute
- [x] I'm willing to submit a PR!
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