fix: better annotation detection

[polentino]

At the moment, redacted works by just checking the name of the annotation, meaning that cases like this

final case class TestClass(@io.github.polentino.redacted.redacted name: String)

or

import io.github.polentino.redacted.{redacted => someRedacted}
final case class TestClass(@someRedacted name: String)

will NOT work. Even worse, false positives like this one might happen

package some.fakepkg

class redacted extends StaticAnnotation

// ... in another file

import some.fakepkg.redacted

final case class TestClass(@redacted name: String)

will still work