- Add support for running shell commands as a non-interactive mode.
- This works by adding new ShellApplicationRunner interface which is
an extension to ApplicationRunner forcing to have exactly one main
ApplicationRunner and then DefaultApplicationRunner dispatches to
new interface ShellRunner which allows to pick between script,
interactive and non-interactive, etc.
- It is sort of a breaking change but works much better not having
a need to have previous hooks between application runners to disable
things at runtime.
- All this makes it closer for a user to have a choice between
using shell commands as is without entering interactive mode.
- Also add SpringShellProperties for better config props support
for boot users.
- Fixes#342