Add vesting benchmarks

[zjb0807]

#998

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.98%. Comparing base (29ee65a) to head (ae891f1).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
vesting/src/benchmarking.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1039      +/-   ##
==========================================
- Coverage   54.10%   53.98%   -0.12%     
==========================================
  Files          50       51       +1     
  Lines        3630     3638       +8     
==========================================
  Hits         1964     1964              
- Misses       1666     1674       +8     

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