Add Align for Stream

[travisbrown]

Follow-up to #3076 adding Align[Stream] with the same implementation as Align[LazyList]. I don't think there's any reason not to include these, @LukaJCB?

I've also added a package-private Align.alignWithIterator helper method to clean up some repetition in Align definitions.

[LukaJCB]

Looks good to me 👍 Just a simple oversight on my end

[travisbrown]

Great, thanks @LukaJCB!

[codecov-io]

Codecov Report

Merging #3144 into master will decrease coverage by 2.34%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3144      +/-   ##
==========================================
- Coverage   93.28%   90.93%   -2.35%     
==========================================
  Files         376      375       -1     
  Lines        7323     7300      -23     
  Branches      174      189      +15     
==========================================
- Hits         6831     6638     -193     
- Misses        492      662     +170

Flag	Coverage Δ
#scala_version_212	?
#scala_version_213	90.93% <100%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
...src/main/scala-2.13+/cats/instances/lazyList.scala	100% <100%> (ø)	⬆️
core/src/main/scala/cats/Align.scala	76.47% <100%> (-23.53%)	⬇️
core/src/main/scala/cats/syntax/ior.scala	0% <0%> (-100%)	⬇️
core/src/main/scala/cats/syntax/nested.scala	0% <0%> (-100%)	⬇️
...re/src/main/scala/cats/syntax/traverseFilter.scala	0% <0%> (-100%)	⬇️
core/src/main/scala/cats/syntax/set.scala	0% <0%> (-100%)	⬇️
core/src/main/scala/cats/syntax/TrySyntax.scala	0% <0%> (-100%)	⬇️
core/src/main/scala/cats/syntax/function1.scala	0% <0%> (-100%)	⬇️
core/src/main/scala/cats/syntax/eitherK.scala	0% <0%> (-100%)	⬇️
core/src/main/scala/cats/syntax/option.scala	30% <0%> (-70%)	⬇️
... and 48 more

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