run-make-support: introduce macro for common methods to avoid repetition

Add a helper macro for adding common methods to command wrappers. Common
methods include helpers that delegate to `Command` and running methods.

- `arg` and `args` (delegates to `Command`)
- `env`, `env_remove` and `env_clear` (delegates to `Command`)
- `output`, `run` and `run_fail`

This helps to avoid needing to copy-pasta / reimplement these common
methods on a new command wrapper, which hopefully reduces the friction
for run-make test writers wanting to introduce new command wrappers.

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