feat: Support default values in UpdateSchema

[jonathanc-n]

Is your feature request related to a problem or challenge?

There is a recent PR to support default values in UpdateSchema, it would be good to port that to iceberg-rs as well: https://github.com/apache/iceberg/commit/602c35a31833f8448734781d71d949ec59abe45b

@CTTY Has a comment in #1172 to support default values in UpdateSchema. Here is a reference to the pull request in java.

Describe the solution you'd like

No response

Willingness to contribute

None

[jonathanc-n]

This can be marked as a good first issue @Xuanwo @liurenjie1024

[liamzwbao]

I'd like to take this one once your PR is merged @jonathanc-n. Thanks!