feat(developer): use CompilerEvent for messages in all of kmc

Cleans up majority of remaining kmc-* modules to use CompilerEvent
messages instead of console.log and friends, adding
InfrastructureMessages class for kmc CLI messages.

Consolidates schema loading functions into a single `loadSchema`
function in the CompilerCallbacks interface and implementations.

Moves responsibility for instantiating NodeCompilerCallbacks out of
each individual BuildActivity and into higher level modules.

Fixes return value for failing builds.