Add XmpMeta::name and XmpMeta::set_name accessors

[scouten-adobe]

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 #112 (6ca842e) into main (d6ca127) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   96.45%   96.51%   +0.06%     
==========================================
  Files           7        7              
  Lines         847      862      +15     
==========================================
+ Hits          817      832      +15     
  Misses         30       30              

Impacted Files	Coverage Δ
src/ffi.rs	100.00% <ø> (ø)
src/xmp_meta.rs	100.00% <100.00%> (ø)

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