feat: rust event verifier using native assets

[frnandu]

Using:

• https://pub.dev/packages/native_toolchain_rust
• https://pub.dev/packages/ffigen

We are now able to use rust event verifier implementation using the new native assets without needing flutter nor a separate package 🎉

fixes #287

[frnandu]

But it does NOT work on web since it needs flutter, so we're keeping the package ndk_rust_verifier which is to be moved into ndk_flutter package implemented in #244

[frnandu]

since we now have a web verifier, we might be able to allows either use the native assets rust version or the web, not needing anymore the flutter bridge external package, TBC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.25%. Comparing base (4b0e8a5) to head (0f6058d).
⚠️ Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
+ Coverage   75.12%   75.25%   +0.12%     
==========================================
  Files         144      145       +1     
  Lines        5741     5771      +30     
==========================================
+ Hits         4313     4343      +30     
  Misses       1428     1428              

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[1-leo]

Can you add instructions on what to do when modifying the rust code (e.g. run the generator)

We now have /ndk/lib/src/ is this intended, or can we move/organize it somewhere else? How would the process look like if we want to extend functionality?

Are there docs on how to create the pointers and conversions to rust?

I would like to change the rust code to #432 making #432 obsolete.
Comparing performance native assets vs. rust bridge

[frnandu]

Can you add instructions on what to do when modifying the rust code (e.g. run the generator)

We now have /ndk/lib/src/ is this intended, or can we move/organize it somewhere else? How would the process look like if we want to extend functionality?

Are there docs on how to create the pointers and conversions to rust?

I would like to change the rust code to #432 making #432 obsolete. Comparing performance native assets vs. rust bridge

The lib/src/rust_lib.dart file is auto-generated by ffigen and follows the native assets convention.
I don't think you need to run anything to generate it, simply modify the rust code and it should just work.

For docs on pointers and conversions the best place is probably https://pub.dev/packages/ffi