Add customData() to ExtensionLib which returns extra suffix to extension

[k06a]

No description provided.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.68% ⚠️

Comparison is base (6a3522b) 82.36% compared to head (7882da5) 81.68%.
Report is 2 commits behind head on master.

❗ Current head 7882da5 differs from pull request most recent head c80c326. Consider uploading reports for the commit c80c326 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
- Coverage   82.36%   81.68%   -0.68%     
==========================================
  Files          23       23              
  Lines         482      486       +4     
  Branches      113      113              
==========================================
  Hits          397      397              
- Misses         85       89       +4     

Files Changed	Coverage Δ
contracts/libraries/ExtensionLib.sol	84.61% <0.00%> (-15.39%)	⬇️

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