Adding operators for Java Bytecode

[popthink]

As I described in #111

Some operator is missing currently.

While I was figuring out the AST tree structure for operators, I found "new" operator which is not in the schema.

It is not part of schema but.. In my opinion, it is needed definitely. Better than unknown node.

In addition, I linked a url which can be used for inferencing AST tree structure of .instanceOf.

[DavidBakerEffendi]

I agree - I'll speak to Fabian about why their new operator doesn't have a specific node. Perhaps it should be a Call node with an io.shiftleft.codepropertygraph.generated.Operators entry.

[DavidBakerEffendi]

For reference, here is an example of some of the nodes:

joern> g.all.filter(_.label == "UNKNOWN").l 
res2: List[StoredNode] = List(
  Unknown(
    id -> 5764607523409234892L,
    code -> "new java.util.LinkedList",
    parserTypeName -> "JNewExpr",
    order -> 2,
    argumentIndex -> 2,
    typeFullName -> "java.util.LinkedList",
    lineNumber -> Some(value = 9),
    columnNumber -> None,
    depthFirstOrder -> None,
    internalFlags -> None,
    dynamicTypeHintFullName -> List()
  ),
  Unknown(
    id -> 5764607523409234897L,
    code -> "new java.util.LinkedList",
    parserTypeName -> "JNewExpr",
    order -> 2,
    argumentIndex -> 2,
    typeFullName -> "java.util.LinkedList",
    lineNumber -> Some(value = 10),
    columnNumber -> None,
    depthFirstOrder -> None,
    internalFlags -> None,
    dynamicTypeHintFullName -> List()
  ),
  Unknown(
    id -> 8070450532372928840L,
    code -> "newarray (int)[5]",
    parserTypeName -> "JNewArrayExpr",
    order -> 2,
    argumentIndex -> 2,
    typeFullName -> "int[]",
    lineNumber -> Some(value = 6),
    columnNumber -> None,
    depthFirstOrder -> None,
    internalFlags -> None,
    dynamicTypeHintFullName -> List()
  )
)