feat(tools/magrathea): wire up parsed targets with commands r/3290

magrathea now does what it says on the tin - build and shell commands
can be used with the targets specified on the command line.

implementation notes:

* string representation of target has been changed to look like the
  target spec format, this is now used in user-facing messages

* errors returned by the target parser make the program exit with
  status 1

* normalisation could be done better (for example, maybe it makes
  sense to always do it) but it's good enough for now

Change-Id: Ib85f389a5cec92b3c2f3b9c0b40764435bbcc68b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4394
Tested-by: BuildkiteCI
Reviewed-by: wpcarro <wpcarro@gmail.com>

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