Add metrics for nonce mismatch & pending nonce

[codchen]

Describe your changes and provide context

Add two sets of metrics:

• count when transaction is included in a block but failed due to nonce mismatch
• count when transaction's nonce is added as pending, as well as the event that causes the pending nonce to settle (either accepted or rejected)

Testing performed to validate your change

[codecov]

Codecov Report

❌ Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 27.18%. Comparing base (2ab1daf) to head (ed3e42e).

Files with missing lines	Patch %	Lines
x/evm/ante/sig.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2439   +/-   ##
=======================================
  Coverage   27.17%   27.18%           
=======================================
  Files        1466     1466           
  Lines      144436   144461   +25     
=======================================
+ Hits        39256    39265    +9     
- Misses     101823   101834   +11     
- Partials     3357     3362    +5     

Files with missing lines	Coverage Δ
utils/metrics/metrics_util.go	69.80% <100.00%> (+2.56%)	⬆️
x/evm/ante/sig.go	81.81% <80.00%> (-0.11%)	⬇️

... and 7 files with indirect coverage changes

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