Add -Wimplausible-patterns option

[lenguyenthanh]

I wonder should we include this to default options. It seems very useful but not sure how stable it is.

reference:

• Improve logic when to emit pattern type error scala/scala3#18093
• Pattern matching against enum case without parameters compiles without warnings scala/scala3#21618

[joan38]

Tried on our 20k LOC project and it worked without warning or false positive. So I'd enable it by default too.
Is this enabled by -Wall too?

[lenguyenthanh]

Is this enabled by -Wall too?

did a quick check, the answer is yes. The code below emit warnings.

//> using scala 3.nightly
//> using options -Wall

enum Foo:
  case Bar(i: Int)
case class Container(foo: Foo) 

@main def main = Container(Foo.Bar(1)) match {
  case Container(Foo.Bar) => println("yes")
  case _ => println("no")
}