Add histograms for pool-ke session durations.

[davidv1992]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 69.86301% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.55%. Comparing base (58d2979) to head (b830e5a).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
nts-pool-ke/src/pool_ke.rs	70.58%	15 Missing ⚠️
nts-pool-ke/src/servers.rs	68.18%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #421   +/-   ##
=======================================
  Coverage   71.54%   71.55%           
=======================================
  Files          61       61           
  Lines       13717    13790   +73     
=======================================
+ Hits         9814     9867   +53     
- Misses       3903     3923   +20     

Flag	Coverage Δ
beta	71.76% <69.86%> (-0.02%)	⬇️
fuzz	64.99% <ø> (+4.08%)	⬆️
fuzz-client_request	40.14% <ø> (+4.31%)	⬆️
fuzz-key_exchange_response	41.30% <ø> (ø)
fuzz-record	35.93% <ø> (ø)
fuzz-server_information_response	25.43% <ø> (+0.46%)	⬆️
msrv	71.44% <69.86%> (+0.02%)	⬆️
stable	71.78% <69.86%> (+0.01%)	⬆️
test	71.47% <69.86%> (-0.01%)	⬇️
x86_64-unknown-linux-gnu	71.47% <69.86%> (-0.02%)	⬇️
x86_64-unknown-linux-musl	71.76% <69.86%> (-0.02%)	⬇️

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