Removed Ops and replaced them with forwarders.

[drdozer]

Thank you for contributing to Cats!

This is a kind reminder to run sbt prePR and commit the changed files, if any, before submitting.

[kailuowang]

is it possible to add some benchmark here to verify the performance?

[codecov-io]

Codecov Report

Merging #2766 into master will decrease coverage by 0.05%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master    #2766      +/-   ##
==========================================
- Coverage   95.34%   95.29%   -0.06%     
==========================================
  Files         363      363              
  Lines        6785     6818      +33     
  Branches      283      303      +20     
==========================================
+ Hits         6469     6497      +28     
- Misses        316      321       +5

Impacted Files	Coverage Δ
core/src/main/scala/cats/syntax/partialOrder.scala	100% <100%> (+100%)	⬆️
core/src/main/scala/cats/syntax/order.scala	100% <100%> (+100%)	⬆️
core/src/main/scala/cats/syntax/semigroup.scala	50% <33.33%> (+50%)	⬆️
core/src/main/scala/cats/syntax/eq.scala	40% <50%> (+40%)	⬆️
core/src/main/scala/cats/syntax/group.scala	75% <66.66%> (+75%)	⬆️
alleycats-core/src/main/scala/alleycats/Zero.scala	0% <0%> (ø)	⬆️
laws/src/main/scala/cats/laws/FoldableLaws.scala	100% <0%> (ø)	⬆️
...lleycats-core/src/main/scala/alleycats/Empty.scala	0% <0%> (ø)	⬆️
alleycats-core/src/main/scala/alleycats/One.scala	0% <0%> (ø)	⬆️
core/src/main/scala/cats/data/NonEmptyList.scala	100% <0%> (ø)	⬆️
... and 4 more

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[smarter]

There's a remaining use of Ops in https://github.com/typelevel/cats/blob/master/core/src/main/scala/cats/syntax/hash.scala. Afterwards I think you should be able to delete https://github.com/typelevel/cats/blob/master/macros/src/main/scala/cats/macros/Ops.scala and remove machinist from build.sbt.

[kailuowang]

We can't simply remove this code. we need to create two versions of it, one for scala 2.x with the current implementation and another with the new scala3 implementation. Like in this example
https://github.com/typelevel/cats/tree/master/core/src/main/scala-2.13%2B/cats/compat
we created two versions of cats.compat.SortedSet

[LukaJCB]

Merge error?

[smarter]

I've made updated PRs for the machinist part: #2925 and the FunctionK part (using a different solution proposed on the issue): #2926, so this PR can be closed.