Add shift builtin (fix #4168).

[ak3n]

should fix #4168

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[michaelpj]

I don't want to do this just now for two reasons:

1. We need to sort out how we're going to manage adding builtins. In particular we need to not let them sneak into plutus-apps too soon.
2. We should maybe decide which bit-manipulating operations we want overall and do them in a batch.

[kwxm]

Superseded by #4733.