Exposed functions to add support for editor extensions

[Dennitz]

• moved actual replication step of replicate into separate function in utils.js
• added option to pass in the current working directory for some of the util functions (because process.cwd() doesn't work for vscode extensions)
• exposed utils.js so that its functions can be used by other modules
• added typescript definition file for those functions (only the ones i used in vscode-generact)

[codecov-io]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #11   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          31     57   +26     
  Branches        4      8    +4     
=====================================
+ Hits           31     57   +26

Impacted Files	Coverage Δ
src/utils.js	100% <100%> (ø)	⬆️

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[diegohaz]

Thank you, @Dennitz. Will take a look at this as soon as possible.

[diegohaz]

Hi, @Dennitz. Thank you for your work and I'm sorry for the huge delay.

I've just renamed performReplication to replicate.

Released in v0.3.0.

Will send a PR to your repo later.