feat: provision package refactor and a new mode, "mulocal" (multi-user with independent sessions)

Description

The main change introduced in this MR: mulocal mode which allows having independent sessions. Now multiple users can change DB not interfering with each other – it feels like multiple "parralel" universes.

All changes introduced in the MR:

• Provision
  • Separate to different files
  • Add modes: local, mulocal
  • Add runners which encapsulate systems calls
  • Add separate Postgres and ZFS specific functions for reusability
  • Inlined and simplified aws mode
  • Improved Postgres start and stop logic
• Configs
  • Add mode param and mode specific configs
  • Rename provision.yaml config to provisioning.aws.sample.yaml (to not create git diff on config edits)
  • Updated samples configs
  • New Postgres and ZFS configuration params
• Bot
  • Start session of state changing commands
  • Stop idle sessions
• Util
  • Number of util functions

TODO for separate MRs:

• Refactor aws mode using runners
• Ports synchornization in mulocal mode
• Check ports availability on init in mulocal mode

Please, mark this checkboxes, if

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes and they have been reviewed OR there are no API changes

Related issue

Closes #53.

Examples

[present examples for reviewers: new CLI output, screenshots, etc]