Helper functions for AddressFromPrivateKey and AddressFromPublicKey

[zone117x]

Description

Creating an address from a public or private key typically involved code like:

  function getAddressFromPrivateKey(privateKey: string): string {
    const addrVer = addressHashModeToVersion(
      AddressHashMode.SerializeP2PKH,
      TransactionVersion.Testnet
    );
    const pubKey = pubKeyfromPrivKey(privateKey);
    const addr = addressFromPublicKeys(addrVer, AddressHashMode.SerializeP2PKH, 1, [pubKey]);
    const addrString = addressToString(addr);
    return addrString;
  }

Helper functions are implemented so this can be done with:

getAddressFromPrivateKey(privateKey, TransactionVersion.Testnet);

For details refer to issue #123

Type of Change

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

Does this introduce a breaking change?

No

Are documentation updates required?

No

Provide context on how tests should be performed.

1. Is testing required for this change?
2. If it’s a bug fix, list steps to reproduce the bug
3. Briefly mention affected code paths
4. List other affected projects if possible
5. Things to watch out for when testing

Checklist

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

[codecov[bot]]

Codecov Report

Merging #82 into master will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
+ Coverage   84.86%   84.99%   +0.12%     
==========================================
  Files          26       26              
  Lines        1434     1446      +12     
  Branches      264      268       +4     
==========================================
+ Hits         1217     1229      +12     
  Misses        215      215              
  Partials        2        2              

Impacted Files	Coverage Δ
src/keys.ts	96.00% <100.00%> (+0.76%)	:arrow_up:

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