poc: tx-template

[r4mmer]

Acceptance Criteria

• POC for transaction template

Simple usage

const interpreter = new WalletTxTemplateInterpreter(wallet);
const template = new TransactionTemplateBuilder()
                                      .addRawInput(inputTxId, inputIndex)
                                      .addRawOutput(100, 'a-script')
                                      .export();

const tx = await interpreter.build(template);

[codecov]

Codecov Report

Attention: Patch coverage is 0.26525% with 376 lines in your changes missing coverage. Please review.

Project coverage is 76.13%. Comparing base (c9905b9) to head (b0e86dd).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/template/transaction/executor.ts	0.00%	163 Missing ⚠️
src/template/transaction/builder.ts	0.00%	67 Missing ⚠️
src/template/transaction/interpreter.ts	0.00%	62 Missing ⚠️
src/template/transaction/context.ts	0.00%	47 Missing ⚠️
src/template/transaction/instructions.ts	0.00%	21 Missing ⚠️
src/utils/transaction.ts	0.00%	14 Missing ⚠️
src/template/transaction/setvarcommands.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   80.53%   76.13%   -4.40%     
==========================================
  Files          81       87       +6     
  Lines        6462     6847     +385     
  Branches     1393     1516     +123     
==========================================
+ Hits         5204     5213       +9     
- Misses       1245     1621     +376     
  Partials       13       13              

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