feat: expose createCallRecord

[unional]

Use this function to create an instance of CallRecord in memory.
On top of the data, a CallRecord instance has a tersify() method to ensure when stringifing it using tersify(), all data in the CallRecord will be preserved.

[coveralls]

Coverage remained the same at 100.0% when pulling d5a6be9 on createCallRecord into 19e4218 on master.

[codecov]

Codecov Report

Merging #26 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #26   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           8      9    +1     
  Lines         136    142    +6     
  Branches       27     29    +2     
=====================================
+ Hits          136    142    +6

Impacted Files	Coverage Δ
src/spy.ts	100% <ø> (ø)	⬆️
src/CallRecord.ts	100% <100%> (ø)
src/createCallRecordCreator.ts	100% <100%> (ø)	⬆️
src/index.ts	100% <100%> (ø)	⬆️

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