Use cabal-helper-1.1, add stack-8.10.1.yaml and unify cabal.project's

[jneira]

• For using cabal-helper-1.1 in windows had been necessary pump up Cabal version to 3.0.2.0 in stack.yaml's
• There is a unique cabal.project that works for ghc-8.10.1 and a new stack-8.10.1.yaml both without allow-newer
  • Using git dependencies for branches that add support for ghc-8.10.1 in floskell and cabal-plan
• brittany needs more work to be upgraded, cabal is already excluding it auto from the build plan setting -agpl
• i've set agpl to False temporary in stack (with a comment about)
• I had to restrict opentelemery to 0.3 in cabal.project cause the more recent version 0.4 is not compatible with our code

[lukel97]

This was fixed in mpickering/ghcide on the hls branch. Maybe we can update ghcide first?

[alanz]

I am happy with this,when you resolve the timing issues for the upstream repo

[jneira]

• I've updated lts's to use the last ones for ghc-8.6.5 (this one will not change anymore) and ghc-8.8.3

[jneira]

Failing ci builds are in the test step so it seems the build itself works.