Add Zip for multiple Publishers

[jasdev]

Rough sketch of overloads to allow folks to zip arbitrarily many publishers. I tried to mirror the existing style in the repository, but please feel free to send any and all feedback (no nit too small)! 🙏🏽

[codecov]

Codecov Report

Merging #6 into master will increase coverage by 0.58%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   94.27%   94.86%   +0.58%     
==========================================
  Files          22       24       +2     
  Lines         908     1012     +104     
==========================================
+ Hits          856      960     +104     
  Misses         52       52              

Impacted Files	Coverage Δ
Tests/WithLatestFromTests.swift	100.00% <ø> (ø)
Sources/Operators/ZipMany.swift	100.00% <100.00%> (ø)
Tests/ZipManyTests.swift	100.00% <100.00%> (ø)

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[freak4pc]

[freak4pc]

Hey @jasdev, thank you so much for making this!
I've had a couple of rough days with the entire COVID crisis, sorry this took a bit longer than expected.

This looks really good, I left a couple of minor notes / thoughts that I'd love your thoughts on. LMK!

[jasdev]

I’ve had a couple of rough days with the entire COVID crisis, sorry this took a bit longer than expected.

No worries at all! Hope any dust has settled and that y’all are safe. Never any rush to reply—it’s already inspiring that you’re able to find the time, even as a new parent.

I think I covered everything (sorry for the force push, had a rebasing snag)! Let me know if there’s anything else blocking this PR, when you get some headspace. 🙏🏽

[freak4pc]

I'm a fan of force-push on feature branches, no need to apologize :)
Thank you!

[freak4pc]

I added some final nits but this looks awesome, ready from my side.
I think i'll just commit the nits and merge this in.