[analyzer][NFC] Introduce CallDescription::matches() in addition to isCalled()

This patch introduces `CallDescription::matches()` member function,
accepting a `CallEvent`.
Semantically, `Call.isCalled(CD)` is the same as `CD.matches(Call)`.

The patch also introduces the `matchesAny()` variadic free function template.
It accepts a `CallEvent` and at least one `CallDescription` to match
against.

Reviewed By: martong

Differential Revision: https://reviews.llvm.org/D113590