[CAD-2169] Expose API types in a separate package

[ksaric]

https://jira.iohk.io/browse/CAD-2169

Original PR by @hasufell.
Rebased, fixed Cabal build, fixed tests and some minor things.

Note that running tests with Stack now requires:

stack test --fast -j`nproc` --flag 'smash:testing-mode' --flag 'smash-servant-types:testing-mode'

[ksaric]

Addressing #110.

[ksaric]

This is going to be squash-merged if possible since we don't want 5 commits for a single PR.

[hasufell]

This is going to be squash-merged if possible since we don't want 5 commits for a single PR.

That's fine. What you can do in such a case is add this to the end of the commit message (the github API does that too):

Co-authored-by: Julian Ospald <[email protected]>

[hasufell]

Looks good

[ksaric]

I have no idea why this is failing, my attempts at fixing the Nix thingies fail.

[jbgi]

The nix issue was that in haskell.nix, the flags were set only for the smash package but not for the new package.
I added a new smash-exe-testing nix target to keep the normal binary (without testing flag) as default for production.

[jbgi]

bors r+

[iohk-bors]

Build succeeded:

• buildkite/smash
• ci/hydra-eval
• ci/hydra-build:required