Add typed property getters

[scouten-adobe]

Changes in this pull request

This adds typed property getters that use the underlying C++ code to parse property values as bool, i32, i64, f64, and XmpDateTime values.

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 #94 (8622b70) into main (0d6481c) will increase coverage by 1.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   93.84%   94.98%   +1.13%     
==========================================
  Files           7        7              
  Lines         455      558     +103     
==========================================
+ Hits          427      530     +103     
  Misses         28       28              

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

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