Refactor: Parser Improvements, Generics, and helpers

[lytefast]

• add vararg variant to Parser.addRules for simpler addition of rules
• update generics for adding rules
• update control flow to be more explicit about what happens if there's no found rule
• update ParserTest to kotlin and add failure test case for ^
• Don't need the T: Node<R> generic on Parser
  • It didn't offer anything as T was always Node<R> since all the rules generated random nodes. We we also never used it besides just returning T
  • this allows us to drop a few more null checks as well since ParseSpec.root is now non-null

Now the flow looks something like this:

val (rule, matcher) = rules
    .firstMapOrNull { rule ->
      val matcher = rule.match(inspectionSource, lastCapture, builder.state)
      // log + return
    }
    ?: throw ParseException("failed to find rule to match source", source)
// Found logic

vs

var foundRule = false
for (rule in rules) {
  val matcher = rule.match(inspectionSource, lastCapture, builder.state)
  if (matcher != null) {
    logMatch(rule, inspectionSource)
    foundRule = true
    // Found logic
    break
  } else {
    logMiss(rule, inspectionSource)
  }
}

if (!foundRule) {
  throw ParseException("failed to find rule to match source", source)
}

[lytefast]

Added this test

[lytefast]

Got the offline ✔️