Reduce time required for make start

[corollari]

Describe the Solution

Remove neo-scan from the hot path of make start. This would mean that make start would only set up the basic nodes and start up neo-scan in the background. This change would result in the following difference in output:

Currently:

Starting Docker containers...
Waiting for network.......

After the change:

Starting Docker containers...
Waiting for network.......
Network running! 🎉
neo-scan has been started up but is not currently available, once it has finished booting up we will notify you

(later) "neo-scan is up 🎉"

Why?

According to #4, neo-scan's startup time is significantly slowing down neo-local's start up. Therefore, by removing neo-scan from the hot path of neo-local, we could decrease its booting up time significantly without impacting the workflow, as any system which requires neo-scan could just wait for it to be available (we could also add a flag to put neo-scan back in the hot path to facilitate operation for these systems).

If that sounds like something that you would like added I can implement it myself and submit a PR.

[nunojusto]

I think that's a nice optimization. Please make a PR.
Thanks

[corollari]

Taking some time to submit the PR because I can't get neo-local to work and therefore can't test my local changes. Waiting for that to get resolved.