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 Lucene.Net.Util.SystemConsole throws not supported exception in .NET MAUI app running on android/iOS #936 for details.

[paulirwin]

@JayOfemi Thanks for this PR. There are several more places where SystemConsole is used, so this change alone is likely insufficient to address the problem and cover all cases. Also, we'd like to use TextWriter.Null instead of actual null if possible. I will make that change and figure out an approach that will work well for MAUI without regressing other platforms. I'll make sure to include your commit in the history though so you get credit. No need to do anything at this time. Thanks!

[paulirwin]

This was changed to use TextWriter.Null by default which should resolve the issue.