🌱 Filesystem and config persistence cleanup

[Adirio]

• Uses a single filesystem:
  • Injected from cli to the scaffolders instead of creating multiple per scaffold.
  • Injected from cli to the config persistence layer instead of creating one per configuration representation.
• Moves configuration creation, loading and saving operations to pre-/post-run hooks.
• Cleans up subcommand binding methods.
• Creates a new Store interface that abstracts the persistence layer used for Config.

Closes: #1936

[k8s-ci-robot]

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[Adirio]

This should probably be applied with plugin phase 1.5 described in #1990.

/hold

[Adirio]

Definetely closing this in favor of plugin phase 1.5 as implemented in #1991.