[test] Add multisend contract test

[Liuhaai]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Test A
• [ ] Test B

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[codecov[bot]]

Codecov Report

Merging #3238 (2dab81e) into master (faf3c97) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3238      +/-   ##
==========================================
+ Coverage   74.97%   74.98%   +0.01%     
==========================================
  Files         228      229       +1     
  Lines       21367    21382      +15     
==========================================
+ Hits        16019    16034      +15     
  Misses       4488     4488              
  Partials      860      860              

Impacted Files	Coverage Δ
blockchain/integrity/benchmarkdata.go	100.00% <100.00%> (ø)

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[raullenchai]

Close b/c it has been inactive for 1+yr.