hie-bios only loads lazily components other than main by default

[alt-romes]

This is a bad default for the debugger (even though it is a good default for HLS?).
It's surprising that

cradle:
  cabal:
     - path: "./"
        component: "lib:hegg"
     - path: "./test/Test.hs"
        component: "test:hegg-test"

doesn't work, but if we instead force hie-bios to load all units eagerly:

cradle:
  cabal:
    component: "all"

it will.

Note that implicit-hie comes up with the former by default. So, by default, a user cannot set a breakpoint in a non-main unit.

• Duplicate test which sets breakpoint on internal unit but remove the hie.yaml file in it and make sure it still works.

[alt-romes]

Since this requires cross cutting changes, it's likely impossible to make for 0.6.0/the MuniHac talk.

It seems we'll have to resort to cradle: cabal: component: "all" for now