feat: implement athrow instruction

[brianheineman]

No description provided.

[github-actions]

Bencher Report

Branch	implement-athrow-instruction
Testbed	localhost

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• Latency

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Benchmark	Latency	nanoseconds (ns)
from_bytes	📈 view plot ⚠️ NO THRESHOLD	23,996.00
load_hash_map	📈 view plot ⚠️ NO THRESHOLD	29,542.00
load_invalid_class	📈 view plot ⚠️ NO THRESHOLD	26,749.00
runtime_v11	📈 view plot ⚠️ NO THRESHOLD	52,888,000.00
runtime_v17	📈 view plot ⚠️ NO THRESHOLD	50,941,000.00
runtime_v21	📈 view plot ⚠️ NO THRESHOLD	56,134,000.00
runtime_v8	📈 view plot ⚠️ NO THRESHOLD	36,438,000.00
to_bytes	📈 view plot ⚠️ NO THRESHOLD	20,734.00
to_string	📈 view plot ⚠️ NO THRESHOLD	140,150.00
verify	📈 view plot ⚠️ NO THRESHOLD	927.78

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[codecov]

Codecov Report

Attention: Patch coverage is 71.62162% with 21 lines in your changes missing coverage. Please review.

Project coverage is 96.44%. Comparing base (e3ad1ae) to head (2fe6171).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
ristretto_vm/src/instruction/exception.rs	60.41%	19 Missing ⚠️
ristretto_vm/src/frame.rs	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   96.19%   96.44%   +0.25%     
==========================================
  Files         125      126       +1     
  Lines       23340    23403      +63     
==========================================
+ Hits        22451    22571     +120     
+ Misses        889      832      -57     

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