Add tracking of reason for error outcomes in metrics.

[davidv1992]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 45.19231% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.40%. Comparing base (99dd160) to head (ae58a5b).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
nts-pool-ke/src/pool_ke.rs	45.19%	57 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #435      +/-   ##
==========================================
- Coverage   71.53%   71.40%   -0.14%     
==========================================
  Files          61       61              
  Lines       13790    13862      +72     
==========================================
+ Hits         9865     9898      +33     
- Misses       3925     3964      +39     

Flag	Coverage Δ
beta	71.61% <45.19%> (-0.15%)	⬇️
fuzz	60.79% <ø> (-0.12%)	⬇️
fuzz-client_request	35.82% <ø> (ø)
fuzz-key_exchange_response	41.30% <ø> (ø)
fuzz-record	35.93% <ø> (ø)
fuzz-server_information_response	25.43% <ø> (+0.46%)	⬆️
msrv	71.28% <45.19%> (-0.14%)	⬇️
stable	71.65% <45.19%> (-0.13%)	⬇️
test	71.34% <45.19%> (-0.14%)	⬇️
x86_64-unknown-linux-gnu	71.33% <45.19%> (-0.12%)	⬇️
x86_64-unknown-linux-musl	71.62% <45.19%> (-0.14%)	⬇️

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