[PR] feat(services/azfile): Add user defined metadata support [opendal]

["zhan7236 (via GitHub)" <gi...@apache.org>]

zhan7236 opened a new pull request, #6841:
URL: https://github.com/apache/opendal/pull/6841

   # Which issue does this PR close?
   
   Part of #4842.
   
   # Rationale for this change
   
   This PR adds user defined metadata support for the Azure File service (`azfile`), which allows users to write and read custom metadata along with their files.
   
   # What changes are included in this PR?
   
   - Add `X_MS_META_PREFIX` constant (`"x-ms-meta-"`) in `core.rs` for user metadata HTTP header prefix
   - Add user metadata headers support in `azfile_create_file` function
   - Enable `write_with_user_metadata` capability in the service
   - Parse user metadata from response headers in `stat` function using `parse_prefixed_headers`
   
   # Are there any user-facing changes?
   
   Yes, users can now use `write_with().user_metadata()` to set custom metadata when writing files to Azure File service, and retrieve them via `stat()`.
   
   Example:
   ```rust
   let metadata = vec![("location".to_string(), "everywhere".to_string())];
   op.write_with(&path, content)
       .user_metadata(metadata)
       .await?;
   
   let meta = op.stat(&path).await?;
   let user_meta = meta.user_metadata();


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Re: [PR] feat(services/azfile): Add user defined metadata support [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo merged PR #6841:
URL: https://github.com/apache/opendal/pull/6841


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