WIP: [TM-370] Private chain experiments

Description

In this MR scripts for running private blockchain are added.

For now, doc highly likely has some typos and mistakes. Also, the scripts also probably have some bugs.

The current version of scripts was tested on Ubuntu.

The following plans are:

• Get rid of bugs. (hopefully)
• Test scripts on Fedora.
• Add nix expression based on (tezos-packaging)[https://github.com/serokell/tezos-packaging] for building patched binaries.
• Add public cache for tezos-packaging to provide painless way without building gcc's and ocaml compilers from scratch.

The last two points are probably will be done not in the scope of this MR.

Related issue(s)

https://issues.serokell.io/issue/TM-370

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