Fix(java/sql): Fix NullPointerException in TextTableProvider for Java 17

[liferoad]

The TextTableProvider was failing with a NullPointerException when using the JSON format on java 17:

> Task :sdks:java:extensions:sql:test

org.apache.beam.sdk.extensions.sql.meta.provider.text.TextTableProviderTest > testJson FAILED
    org.apache.beam.sdk.extensions.sql.impl.ParseException at TextTableProviderTest.java:224
        Caused by: org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.tools.ValidationException at TextTableProviderTest.java:224
            Caused by: java.lang.NullPointerException at TextTableProviderTest.java:224

org.apache.beam.sdk.extensions.sql.meta.provider.text.TextTableProviderTest > testWriteJson FAILED
    org.apache.beam.sdk.extensions.sql.impl.ParseException at TextTableProviderTest.java:305
        Caused by: org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.tools.ValidationException at TextTableProviderTest.java:305
            Caused by: java.lang.NullPointerException at TextTableProviderTest.java:305

Overriding the buildIOWriter method in TextJsonTable to correctly handle writing JSON files.

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[Abacn]

The tests has been exercised on Java17 and passed. I also ran locally (with Java17 solely) ./gradlew :sdks:java:extensions:sql:test --tests org.apache.beam.sdk.extensions.sql.meta.provider.text.TextTableProviderTest test also passed. I'm using Temurin-17.0.8+7

Observed test failures might be due to unrelated issue like gradle cache etc

[liferoad]

@damccorm also confirmed the tests work with his Java 17. Let me close this for now.