Add Applicative syntax

[notxcain]

This PR adds Applicative syntax. Fixes #882.
Not sure if I should test for Applicative#traverse and Applicative#sequence.
I don’t know if simulacrum generates anything for these methods.

[codecov-io]

Current coverage is 88.90%

Merging #884 into master will decrease coverage by -0.15% as of 4a53488

@@            master   #884   diff @@
=====================================
  Files          174    175     +1
  Stmts         2384   2388     +4
  Branches        76     76       
  Methods          0      0       
=====================================
  Hit           2123   2123       
  Partial          0      0       
- Missed         261    265     +4

Review entire Coverage Diff as of 4a53488

Powered by Codecov. Updated on successful CI builds.

[adelbertc]

👍

[notxcain]

@adelbertc if there is nothing valuable in Ops generated by simulacrum, maybe it worth completely removing conversion to Ops?

[adelbertc]

Sounds good with me. And merge conflicts

[notxcain]

@adelbertc done!

[stew]

👍