Support for SAM in symbol for semanticdb

[tgodzik]

Currently, when using code such as:

// applies to abstract classes too
trait MyTestTrait {
  def compute(input: Int): Int
}

// MyTestObject could be a class, trait, etc.
object MyTestObject {

  val test1: MyTestTrait = (input: Int) => input + 1
  def test2: MyTestTrait = (input: Int) => input + 2

  val test3: MyTestTrait = new MyTestTrait {
    def compute(input: Int): Int = input + 3
  }
  def test4: MyTestTrait = new MyTestTrait {
    def compute(input: Int): Int = input + 4
  }

}

There is no new symbol entry for the anonymous class coming from SAM.

We should do it similar as we for anonymous classes.