Use cabal to build wire-server (opt-in)

[smatting]

This PR should enable us to try using cabal instead of stack locally.

This PR:

• adds nix files that provide the stack2cabal tool
• instructions how to convert the stack project to a cabal project
• Adds a cabal.project and cabal.freeze file generated by stack2cabal
• Adds a flag WIRE_BUILD_WITH_CABAL that is, When it is set cabal will be used for make fast and make install from the root Makefile.
• Adds two make targets that use cabal to build:

   make c package=brig # to build and install all of brig's executables
   make c package=brig test=1 # also run unit tests
   make ci package=brig pattern="delete" # build and run brig's integration tests

• Deletes package.yaml of types-common-journal and wire-message-proto-lens, because the cabal files generated with hpack don't work with cabal.

For details see tools/convert-to-cabal/README.md included in this PR.

Building with cabal has been tested only locally. For building on CI/withou nix follow-up PRs are needed.

Checklist

• The PR Title explains the impact of the change.
• The PR description provides context as to why the change should occur and what the code contributes to that effect. This could also be a link to a JIRA ticket or a Github issue, if there is one.

[fisx]

this will affect #1852, but i think we can work on it in parallel. getting all the dependencies in shape for ghc10 and all the new packages will still be required, right?

[smatting]

this will affect #1852, but i think we can work on it in parallel. getting all the dependencies in shape for ghc10 and all the new packages will still be required, right?

Yes, I suggest we finish #1852 first and then rerun stack2cabal (included in this PR) again.