Rename faker creation, export UnmockFaker.

[ksaaskil]

• unmock.newFaker() is too long, unmock.faker() says the same
• The class should also be exported so one can do, for example

  import unmock, { UnmockFaker } from "unmock";
  const faker: UnmockFaker = unmock.faker()

[codecov-io]

Codecov Report

Merging #363 into dev will increase coverage by <.01%. The diff coverage is 50%.

@@            Coverage Diff             @@
##              dev     #363      +/-   ##
==========================================
+ Coverage   80.38%   80.39%   +<.01%     
==========================================
  Files          54       54              
  Lines        2417     2418       +1     
  Branches      585      585              
==========================================
+ Hits         1943     1944       +1     
  Misses        474      474

Impacted Files	Coverage Δ
packages/unmock-core/src/index.ts	79.62% <50%> (+0.38%)	:arrow_up:

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