build: Better UX for bootstrapper option

[Wondertan]

Goal

We should support a simple flag during compilation to tell this binary should be used as a network bootstrapper.

Current Solution

In upcoming #57 there is the flag in Config that configures a node to run as a Bootstrapper. However, this should not be done there, as users won't run personal bootstrappers, while the Config is a part of UX, so we should allow users to mistakenly configure their nodes as bootstrappers.

Desired solution

The bootstrap should be a complied time parameter.

[Bidon15]

Grooming 12/07/2022:

• Changing the issue from Post-Mainnet to Mainnet
• it's still a low priority one
  • we can defer it again to Post-Mainnet if we don't have the capacity

[ramin]

no longer relevant