Streaming XMP write support for PNG

[mauricefisher64]

Changes in this pull request

PNG files streaming is now fully supported by PR

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-commenter]

Codecov Report

Attention: Patch coverage is 83.47107% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 80.31%. Comparing base (ad4c015) to head (d5be821).

Files	Patch %	Lines
sdk/src/asset_handlers/png_io.rs	83.47%	20 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
+ Coverage   80.28%   80.31%   +0.03%     
==========================================
  Files          82       82              
  Lines       25758    25867     +109     
==========================================
+ Hits        20680    20776      +96     
- Misses       5078     5091      +13     

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[dkozma]

As part of the png_pong fix, the MSRV for that crate was updated to 1.77 😞 - looking to see if the author can revise that to an earlier version, since the fix shouldn't necessitate an increase in the Rust version.

[dkozma]

I've contacted the author of the png_pong crate regarding the MSRV version in AldaronLau/png_pong#22 and will update this ticket with any new information.