[Feature] Paimon lance format should support timestamp_ltz

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Motivation

Currently, Paimon lance format doesn't support timestamp_ltz, when set timezone to `GMT-10:00`, it will throw `Unsupported timestamp type: timestamp:us:GMT-10:00`.

### Solution

The exception is thrown in https://github.com/lance-format/lance/blob/main/rust/lance-core/src/datatypes.rs#L357.
The core reason is arrow-rust can't recognize `GMT-10:00`, it can only recognize IANA timezone like `America/New_York` or UTC offset format like `+07:30`. So users follow the two ways to set timezone, no exception will happen.

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start by tracing Paimon's lance-format handling for timestamp_ltz and compare the accepted timezone forms with lance-core/src/datatypes.rs. Reproduce the GMT-10:00 failure, then verify that timestamp_ltz works with that timezone while IANA names and UTC offsets remain supported.

Written by the indexing model from the issue text.