feat(mono/zip): add 'ZipWith' operator and reimplement 'Zip'

[jjeffcaii]

No description provided.

[codecov-io]

Codecov Report

Merging #95 (5a9c96c) into master (d693310) will decrease coverage by 0.43%.
The diff coverage is 46.06%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
- Coverage   62.87%   62.43%   -0.44%     
==========================================
  Files         100      100              
  Lines        4412     4470      +58     
==========================================
+ Hits         2774     2791      +17     
- Misses       1386     1413      +27     
- Partials      252      266      +14     

Impacted Files	Coverage Δ
rx/rx.go	0.00% <ø> (ø)
rx/mono/proxy_oneshot.go	27.16% <10.00%> (-2.18%)	⬇️
rx/mono/utils.go	65.97% <28.57%> (-6.53%)	⬇️
rx/mono/zip.go	38.70% <34.48%> (-61.30%)	⬇️
rx/mono/proxy_default.go	85.93% <50.00%> (-2.00%)	⬇️
rx/tuple.go	100.00% <100.00%> (ø)
server.go	71.59% <0.00%> (-1.71%)	⬇️

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