Implement Display for XmpMeta

[scouten-adobe]

Changes in this pull request

Also add a more configurable version XmpMeta::to_string_with_options.

Checklist

• This PR represents a single feature, fix, or change.
• All applicable changes have been documented.
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment.

[codecov]

Codecov Report

Merging #120 (8cb3e55) into main (fc8b896) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   96.58%   96.85%   +0.27%     
==========================================
  Files           7        7              
  Lines         936     1019      +83     
==========================================
+ Hits          904      987      +83     
  Misses         32       32              

Impacted Files	Coverage Δ
src/ffi.rs	100.00% <ø> (ø)
src/lib.rs	100.00% <ø> (ø)
src/xmp_error.rs	100.00% <100.00%> (ø)
src/xmp_meta.rs	99.69% <100.00%> (+0.04%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more