[5.8] adds Str::containsAll() method

[chrisbbreuer]

Hi everyone,

As discussed here #28688 - in order to avoid a breaking change, I abstracted it into a new method called containsAll().

Every now and then I run into a dilemma where I want to check if an array of values is contained within a string.

This adds the functionality to check for all array values inside a string.

Check out the tests to see all the supported scenarios.

I hope you guys find this useful, too 🙂

Chris

[taylorotwell]

Strange not to loop through and use existing contains logic. The checks behave differently.