Add auction benchmarks

[zjb0807]

• add auction benchmarks
• remove unused files currencies/src/default_weight.rs and vesting/src/default_weight.rs

[codecov]

Codecov Report

❌ Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.55%. Comparing base (29ee65a) to head (e74a1be).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
auction/src/benchmarking.rs	0.00%	31 Missing ⚠️
auction/src/weights.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1040      +/-   ##
==========================================
- Coverage   54.10%   53.55%   -0.55%     
==========================================
  Files          50       52       +2     
  Lines        3630     3669      +39     
==========================================
+ Hits         1964     1965       +1     
- Misses       1666     1704      +38     

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