[Typescript] Improve types for isKafkaJSError

[Leo Singer (lpsinger)]

Change the input parameter's type from Error to any. Now you no longer have to write this to silence all type errors:

try {
  // ...
} catch (e) {
  if (e instanceof Error && isKafkaJSError(e) {
    // ...
  }
}

Now you can simply write:

try {
  // ...
} catch (e) {
  if (isKafkaJSError(e)) {
    // ...
  }
}

Declare it as a type predicate so that TypeScript understands that if the function returns true that it narrows the type to KafkaJSError.

Please prefix all TypeScript pull-requests with [Typescript]

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• Contains customer facing changes? Including API/behavior changes
• Did you add sufficient unit test and/or integration test coverage for this PR?
  • If not, please explain why it is not required

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