[I] Make `ManifestMetadata` V1 compliant [iceberg-rust]

[via GitHub]

Fokko opened a new issue, #1281:
URL: https://github.com/apache/iceberg-rust/issues/1281

   ### Apache Iceberg Rust version
   
   None
   
   ### Describe the bug
   
   I noticed that the ManifestMetadata has everything required:
   
   
https://github.com/apache/iceberg-rust/blob/b4bc6dd15ae4f7a4b1c9ce555e3458089a83e228/crates/iceberg/src/spec/manifest/metadata.rs#L30-L42
   
   However, this is not the case for V1:
   
   
![Image](https://github.com/user-attachments/assets/fd26fa13-46d6-4a88-8a3b-fd2bde290526)
   
   I think `schema-id`, `partition-spec-id` and `file-format` should be 
optional. We can fill in `content` with `data` for V1 since that's the only 
option for V1.
   
   ### To Reproduce
   
   _No response_
   
   ### Expected behavior
   
   _No response_
   
   ### Willingness to contribute
   
   None


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