[8.x] Use contract encrypt and decrypt methods

[driesvints]

Alternative to #36566

These changes will make use of the Illuminate\Contracts\Encryption\Encrypter contract's methods so people can still roll their own implementations without running into problems with some framework usages of a concrete implementation. This prevents us from having to widen the contract for no real reason.

[deleugpn]

Widening the contract still offers a better DX, though. The reason Laravel's Crypto Facade have those methods are better DX. I just want to keep that DX when I roll my own.

[driesvints]

I don't agree, sorry. Contracts should be kept as small as possible. The methods you refer to are just DX methods like you say. They don't add anything to what the contract actually represents. They're just convenience methods. You can do the exact same things with the current methods. In general, a contract should offer ways to do something and not duplicate them with extra methods.

[taylorotwell]

I don't like to use encrypt or decrypt really. They use serialization and therefore more overhead.