refactor(phpstan): enhance type enforcement and error handling in shipping rules

This commit enhances the type enforcement in the Shipping module by explicitly checking for method
existence before calls on variable types. In addition, it enforces argument type checks for several
function and method declarations to avoid type-related errors. Moreover, the error handling in
different functions has been improved by catching potential exceptions and logging them for debug
purposes. The commit also optimizes a PHP sorting function by leveraging the spaceship operator
instead of using conventional comparisons.

Related: #55