[RFE] support --no-build in spago run as well

[Hi-Angel]

spago bundle-app has a handy option that skips a bulid: --no-build. It would be great if this option was supported in spago run as well.

Usecase: when running purescript-written backend on a machine with which sources were shared via NFS, spago's attempt to rebuild sources slows down start up time considerably. I found via bpftrace that it's possible to "run" manually by executing node .spago/run.js.

Measuring running time for the code with its main replaced to main = pure unit shows:

Case	Command	Time
Uncached	spago run	50.266 sec
Cached	spago run	2.397 sec
Uncached	node .spago/run.js	11.393 sec
Cached	node .spago/run.js	0.434 sec

That's up to ≈78% improvement.