Action hooks

[denis256]

Describe the solution you'd like
Add support in action for the possibility to run custom code before running action and after, may be helpful to implement complex steps like installing packages, extracting files from archives etc.

Describe alternatives you've considered
Some steps can be implemented as INPUT_PRE_EXEC_number / INPUT_POST_EXEC_number but this is more for single-line commands, which are saved in action file and can't be re-used.

Additional context
N/A