fix: abi validation should allow buffers less than the specified size

[reedrosenbluth]

Description

Allow buffers provided as contract-call arguments to be less than or equal to the size specified in the ABI.

Checklist

• [x] Code is commented where needed
• [x] Unit test coverage for new or modified code paths
• [x] npm run test passes
• [x] Changelog is updated
• [x] Tag 1 of @yknl, @zone117x, @reedrosenbluth for review

[codecov[bot]]

Codecov Report

Merging #96 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #96   +/-   ##
=======================================
  Coverage   84.17%   84.17%           
=======================================
  Files          28       28           
  Lines        1820     1820           
  Branches      390      367   -23     
=======================================
  Hits         1532     1532           
  Misses        286      286           
  Partials        2        2           

Impacted Files	Coverage Δ
src/contract-abi.ts	75.00% <100.00%> (ø)

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