Add a compile time string interpolator

[alonsodomin]

No description provided.

[codecov-io]

Codecov Report

Merging #126 into master will decrease coverage by 0.15%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   92.78%   92.62%   -0.16%     
==========================================
  Files          64       66       +2     
  Lines        1095     1099       +4     
  Branches       59       52       -7     
==========================================
+ Hits         1016     1018       +2     
- Misses         79       81       +2

Impacted Files	Coverage Δ
core/shared/src/main/scala/cron4s/package.scala	0% <0%> (ø)
...re/shared/src/main/scala/cron4s/Interpolator.scala	66.66% <66.66%> (ø)

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