feat: Clarity Strings

[reedrosenbluth]

This PR adds support for the new Clarity string types string-ascii and string-utf8. It does so by introducing corresponding typescript interfaces (StringAsciiCV and StringUtf8CV ), constructor functions to build them, and serialization/deserialization functions. It also adds support for validating ABIs of contracts that deal with string types.

Issue: #110

Type of Change

• [x] New feature
• [ ] Bug fix
• [ ] API reference/documentation update
• [ ] Other

Does this introduce a breaking change?

No

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 #118 into master will increase coverage by 0.18%. The diff coverage is 88.31%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   83.11%   83.30%   +0.18%     
==========================================
  Files          27       28       +1     
  Lines        2079     2156      +77     
  Branches      422      444      +22     
==========================================
+ Hits         1728     1796      +68     
- Misses        347      356       +9     
  Partials        4        4              

Impacted Files	Coverage Δ
src/clarity/types/stringCV.ts	58.33% <58.33%> (ø)
src/contract-abi.ts	76.17% <85.18%> (+1.17%)	:arrow_up:
src/clarity/clarityValue.ts	100.00% <100.00%> (ø)
src/clarity/deserialize.ts	93.44% <100.00%> (+1.13%)	:arrow_up:
src/clarity/index.ts	100.00% <100.00%> (ø)
src/clarity/serialize.ts	97.82% <100.00%> (+0.45%)	:arrow_up:

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