Leave debugStream as null on construction of parser token managers

[JayOfemi]

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Summary of the changes (Less than 80 chars) Leave debugStream as null on construction of parser token managers.

Fixes #{bug number} (in this specific format) Fixes #936

Description

{Detail}

• When debugStream is set to Console.Out by default, StandardSyntaxParserTokenManager throws an exception when constructing a StandardQueryParser on OSes that do not support System.Console, such as iOS and Android.
• debugStream can be set later using the setter, if needed.
• The above is the same for QueryParserTokenManager when constructing a QueryParser.
• See issue https://github.com/apache/lucenenet/issues/936 for details.