fix: Clean up JNI code and properly free strings

[Swatinem]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

This cleans up the JNI layer, removes some unused things like the global transport options, and makes sure to clean up utf strings that have been created.

💡 Motivation and Context

Avoids potential memory leaks and cleans up obsolete code.

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing
• No breaking changes

🔮 Next steps

[marandaneto]

looks good, missing a changelog and filling up the PR template Motivation and Context, is this related to the memory corruption thingie?

[codecov-io]

Codecov Report

Merging #1050 (666c03e) into main (01cfbfe) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1050   +/-   ##
=========================================
  Coverage     72.06%   72.06%           
  Complexity     1338     1338           
=========================================
  Files           138      138           
  Lines          4893     4893           
  Branches        499      499           
=========================================
  Hits           3526     3526           
  Misses         1106     1106           
  Partials        261      261           

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[Swatinem]

is this related to the memory corruption thingie?

I noticed it when investigating, yes

[marandaneto]

is this related to the memory corruption thingie?

I noticed it when investigating, yes

niiice, thank you!

[bruno-garcia]

👀

[bruno-garcia]

Missing a changelog entry

I.e:

• Removing a ton of leaks

[marandaneto]

LGTM