feat: Tx Broadcast Returns Response

[reedrosenbluth]

Description

This PR augments transaction broadcasting such that it returns a response instead of a string. If the response fails it will contain a TxBroadcastError.

The possible reasons for failure are listed here: https://github.com/blockstack/stacks-blockchain/pull/1510/files#diff-98a3f84802c72cc9abbd3ecc208654e0R23

More details in issue #54

This PR also introduces a few custom Error classes.

Review by commit.

Type of Change

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

Does this introduce a breaking change?

This introduces a breaking change since it changes the transaction broadcast API return type.

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 #91 into master will decrease coverage by 0.07%. The diff coverage is 40.69%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   84.25%   84.17%   -0.08%     
==========================================
  Files          27       28       +1     
  Lines        1778     1820      +42     
  Branches      387      390       +3     
==========================================
+ Hits         1498     1532      +34     
- Misses        278      286       +8     
  Partials        2        2              

Impacted Files	Coverage Δ
src/authorization.ts	77.09% <5.26%> (+0.12%)	:arrow_up:
src/errors.ts	14.28% <14.28%> (ø)
src/transaction.ts	79.31% <16.66%> (+0.24%)	:arrow_up:
src/postcondition.ts	88.88% <20.00%> (+0.17%)	:arrow_up:
src/clarity/deserialize.ts	92.30% <25.00%> (+0.15%)	:arrow_up:
src/types.ts	83.03% <33.33%> (+0.07%)	:arrow_up:
src/clarity/serialize.ts	97.36% <50.00%> (+0.03%)	:arrow_up:
src/builders.ts	76.14% <100.00%> (+1.83%)	:arrow_up:
src/constants.ts	100.00% <100.00%> (ø)
src/contract-abi.ts	75.00% <100.00%> (+2.23%)	:arrow_up:
... and 1 more

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