Optimize extension offset bounds checks

[k06a]

··························|·············|·············|·············|················
|  fillContractOrder      ·      79716  ·      96816  ·      88266  ·            2  │
··························|·············|·············|·············|················
|  fillContractOrderExt   ·      83675  ·     110458  ·     101530  ·           21  │
··························|·············|·············|·············|················
|  fillOrder              ·      82072  ·     122115  ·     102755  ·          116  │
··························|·············|·············|·············|················
|  fillOrderExt           ·      78541  ·     129658  ·     104014  ·           80  │
··························|·············|·············|·············|················
|  fillOrderTo            ·          -  ·          -  ·     104985  ·            5  │
··························|·············|·············|·············|················
|  fillOrderToWithPermit  ·     127591  ·     137038  ·     131674  ·           14  │
··························|·············|·············|·············|················

=>

··························|·············|·············|·············|················
|  fillContractOrder      ·      79716  ·      96816  ·      88266  ·            2  │
··························|·············|·············|·············|················
|  fillContractOrderExt   ·      83633  ·     110407  ·     101482  ·           21  │
··························|·············|·············|·············|················
|  fillOrder              ·      82072  ·     122115  ·     102755  ·          116  │
··························|·············|·············|·············|················
|  fillOrderExt           ·      78496  ·     129613  ·     103972  ·           80  │
··························|·············|·············|·············|················
|  fillOrderTo            ·          -  ·          -  ·     104985  ·            5  │
··························|·············|·············|·············|················
|  fillOrderToWithPermit  ·     127591  ·     137038  ·     131674  ·           14  │
··························|·············|·············|·············|················

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6a3522b) 82.36% compared to head (989ac53) 82.36%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #259   +/-   ##
=======================================
  Coverage   82.36%   82.36%           
=======================================
  Files          23       23           
  Lines         482      482           
  Branches      113      113           
=======================================
  Hits          397      397           
  Misses         85       85           

Files Changed	Coverage Δ
contracts/libraries/OffsetsLib.sol	100.00% <ø> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.