Optmize image pull, `fm self` command and update migrations.

[Xieyt]

This PR:

• Introduces the fm self command for internal operations within the FM system. Part 3 of #114. Explore the fm self command on the wiki for more information.
• Enhanced migration executor and adjusted migration for v0.11.0.
• Streamlined the FM command by eliminating Docker image pulls on every invocation. Users can now manually update Docker images using the fm self update images command. Additionally, images are automatically pulled during migrations.