A0-3432: run_nodes.sh revamp, in particular run bootnode as RPC node

[Marcin-Radecki]

Description

This PR revamps scripts/run_nodes.sh so that

• there are only two categories of nodes: RPC node and validator node
• boot node is always the first RPC node
• number of either node type is configurable, but sum must not exceed 10,
• script cmd line args was reworked which is a breaking change
• by default, script ideas all the following: builds aleph-node, bootstraps chain, purges db, removes AlephBFT backups. User can opt-out from either of these, but obviously some of them must be present if others are etc, so the script checks all that
• script now logs with timestamps and colors, which is justifies as the script is not intended to run in CI
• as the script is a front card of our repo and most likely the first point of contact with the new user, it contains now a compact intro
  to chain bootstrap in general
• jq is now needed, though is not hard blocker for me to revert to previous behaviour, now it is just cleaner in bash to parse output of aleph-node key inspect
• base path default was changed from /tmp/ to local ./run-nodes-sh, this is because the user must have write permissions in the repo he or she just cloned, and it's better to have a base path that is not shared with any other files/dirs.
• arguments were synced with docker/docker_entrypoint.sh; they are indeed duplicated now but it does not make sense to extract them to common .sh as at some point run_nodes.sh might become obsolete due to dockerization

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

[ggawryal]

Great job, I like the idea of keeping that script well-documented and user-friendly as a first contact point with the repo. Left minor comments.
Also, maybe @fixxxedpoint will know more context, there was some issue why we disabled purging backups by default (A0-2846). Nevertheless, I think we should be good unless user does something very strange.

[fixxxedpoint]

Well done!