refactor(voice): cleanup voice package

[manchuck]

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #838 (29a2f75) into 3.x (e50c7cb) will increase coverage by 1.90%. The diff coverage is 48.99%.

:exclamation: Current head 29a2f75 differs from pull request most recent head f4d7c5b. Consider uploading reports for the commit f4d7c5b to get more accurate results

@@            Coverage Diff             @@
##              3.x     #838      +/-   ##
==========================================
+ Coverage   80.06%   81.96%   +1.90%     
==========================================
  Files          99      117      +18     
  Lines        1289     1325      +36     
  Branches      257      259       +2     
==========================================
+ Hits         1032     1086      +54     
+ Misses        256      238      -18     
  Partials        1        1              

Impacted Files	Coverage Δ
packages/voice/lib/classes/NCCO/Record.ts	1.35% <1.35%> (+1.35%)	:arrow_up:
packages/voice/lib/classes/NCCO/Connect.ts	2.38% <2.38%> (+2.38%)	:arrow_up:
packages/voice/lib/classes/NCCO/Stream.ts	5.55% <5.55%> (+5.55%)	:arrow_up:
packages/voice/lib/classes/NCCO/Notify.ts	9.09% <9.09%> (+9.09%)	:arrow_up:
packages/voice/lib/classes/NCCO/Talk.ts	60.00% <60.00%> (+30.00%)	:arrow_up:
packages/voice/lib/classes/NCCO/Conversation.ts	61.76% <61.76%> (+1.15%)	:arrow_up:
packages/voice/lib/classes/OutboundCall.ts	71.42% <71.42%> (+4.76%)	:arrow_up:
packages/voice/lib/classes/NCCO/Input.ts	77.77% <77.77%> (+33.33%)	:arrow_up:
packages/voice/lib/voice.ts	95.45% <95.45%> (-0.85%)	:arrow_down:
packages/voice/lib/classes/NCCO/NCCOBuilder.ts	100.00% <100.00%> (+8.33%)	:arrow_up:
... and 21 more

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