Add encoded keys/credentials/etc

[vkostyukov]

To accomodate #995.

[codecov-io]

Codecov Report

Merging #999 into master will increase coverage by 0.62%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #999      +/-   ##
==========================================
+ Coverage   83.37%   83.99%   +0.62%     
==========================================
  Files          50       50              
  Lines         854      856       +2     
  Branches       51       54       +3     
==========================================
+ Hits          712      719       +7     
+ Misses        142      137       -5

Impacted Files	Coverage Δ
core/src/main/scala/io/finch/endpoint/path.scala	96% <0%> (+0.34%)	⬆️
core/src/main/scala/io/finch/Input.scala	100% <0%> (+9.61%)	⬆️

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[arron-green]

🎉🎉

[arron-green]

@vkostyukov should we change this PR to merge into the WIP branch in #995 rather than master?

[vkostyukov]

@vkostyukov should we change this PR to merge into the WIP branch in #995 rather than master?

Let's merge these two PRs into the same branch (off of master) and keep iterating there.