PoC new apply on get, set, update and add

[nlepage]

I wrote a new apply based on curry and nav and used it on set.

[nlepage]

You can now write:

const obj = { nested: { prop: 5 } }
apply(v => v + 1)('nested.prop')(obj)

Which can be read "apply v + 1 at nested.prop of obj"

[codecov-io]

Codecov Report

Merging #303 into dev will decrease coverage by 0.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #303      +/-   ##
==========================================
- Coverage   99.17%   99.15%   -0.02%     
==========================================
  Files         106      107       +1     
  Lines         364      357       -7     
==========================================
- Hits          361      354       -7     
  Misses          3        3

Impacted Files	Coverage Δ
packages/immutadot/src/path/apply.js	100% <100%> (ø)	:arrow_up:
packages/immutadot/src/core/set.js	100% <100%> (ø)	:arrow_up:
packages/immutadot/src/core/apply.js	100% <100%> (ø)
packages/immutadot/src/core/get.js	100% <100%> (ø)	:arrow_up:
packages/immutadot/src/lang/add.js	100% <100%> (ø)	:arrow_up:
packages/immutadot/src/core/update.js	100% <100%> (ø)	:arrow_up:

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[nlepage]

Extended to get, update and add.

[nlepage]

This is ready for review