Implementing the new interfaces

[daviddias]

WIP

ref: ipfs-inactive/interface-js-ipfs-core#162

[codecov]

Codecov Report

Merging #619 into master will increase coverage by 0.26%.
The diff coverage is 88.1%.

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
+ Coverage    83.6%   83.86%   +0.26%     
==========================================
  Files         105      112       +7     
  Lines        1464     1624     +160     
==========================================
+ Hits         1224     1362     +138     
- Misses        240      262      +22

Impacted Files	Coverage Δ
src/utils/load-commands.js	100% <ø> (ø)	⬆️
src/files/index.js	100% <ø> (ø)	⬆️
src/files/add-pull-stream.js	100% <100%> (ø)
src/files/add-readable-stream.js	100% <100%> (ø)
src/files/cat.js	100% <100%> (ø)	⬆️
src/files/get.js	93.1% <100%> (+4.21%)	⬆️
src/ls-pull-stream.js	75.86% <75.86%> (ø)
src/ls-readable-stream.js	78.57% <78.57%> (ø)
src/files/cat-pull-stream.js	87.5% <87.5%> (ø)
src/files/cat-readable-stream.js	87.5% <87.5%> (ø)
... and 10 more

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[daviddias]

I'm confident with this PR and I went to merge it with ipfs-inactive/interface-js-ipfs-core#162. Can I get CR from someone?

[daviddias]

@pgte will your PR -- #629 --fix the outstanding issues here (only visible in CI) ?

Edit: It was the old go-ipfs issue