LeaseSet2 support

[str4d]

Implements Prop123.

[codecov-io]

Codecov Report

Attention: Patch coverage is 69.12029% with 172 lines in your changes missing coverage. Please review.

Project coverage is 53.51%. Comparing base (87a8068) to head (51281c3).
Report is 89 commits behind head on main.

Files with missing lines	Patch %	Lines
src/data/ls2/enc/auth.rs	50.56%	44 Missing ⚠️
src/data/ls2/frame.rs	63.46%	38 Missing ⚠️
src/data/ls2/enc.rs	87.00%	26 Missing ⚠️
src/data/ls2/enc/frame.rs	81.30%	23 Missing ⚠️
src/i2np/frame.rs	0.00%	14 Missing ⚠️
src/crypto/frame.rs	0.00%	10 Missing ⚠️
src/netdb/mod.rs	0.00%	10 Missing ⚠️
src/crypto/mod.rs	0.00%	4 Missing ⚠️
src/i2np/mod.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   53.94%   53.51%   -0.43%     
==========================================
  Files          30       31       +1     
  Lines        3711     3793      +82     
==========================================
+ Hits         2002     2030      +28     
- Misses       1709     1763      +54     

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