Options object argument for transaction builders

[yknl]

This PR replaces the arguments to transaction builder functions with an options object. This provides a cleaner interface compared to a list of optional and non-optional args.

New Usage:

const txOptions = {
  recipient: 'SP3FGQ8Z7JY9BWYZ5WM53E0M9NK7WHJF0691NZ159',
  amount: new BigNum(12345),
  senderKey: 'b244296d5907de9864c0b0d51f98a13c52890be0404e83f273144cd5b9960eed01',
  network,
  memo: "test memo",
  nonce: new BigNum(0),
  fee: new BigNum(200),
};

const transaction = await makeSTXTokenTransfer(txOptions);

Resolves issue #68

Type of Change

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

Does this introduce a breaking change?

This update breaks the transaction builder function APIs: makeSTXTokenTransfer makeSmartContractDeploy makeContractCall

Are documentation updates required?

Readme has been updated.

Testing information

Transaction builders should continue to generate valid transactions.

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
• [ ] Tag 1 of @yknl, @zone117x, @reedrosenbluth for review

[codecov[bot]]

Codecov Report

Merging #72 into master will decrease coverage by 0.55%. The diff coverage is 75.75%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
- Coverage   85.45%   84.90%   -0.56%     
==========================================
  Files          26       26              
  Lines        1403     1438      +35     
  Branches      250      262      +12     
==========================================
+ Hits         1199     1221      +22     
- Misses        203      215      +12     
- Partials        1        2       +1     

Impacted Files	Coverage Δ
src/utils.ts	73.43% <ø> (ø)
src/builders.ts	71.50% <71.42%> (-3.66%)	:arrow_down:
src/authorization.ts	76.96% <100.00%> (+0.26%)	:arrow_up:
src/keys.ts	95.23% <100.00%> (+0.23%)	:arrow_up:
src/network.ts	100.00% <100.00%> (ø)
src/transaction.ts	79.06% <100.00%> (+0.49%)	:arrow_up:

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[kyranjamie]

Nice update 👍