fix(java): add reflection configuration for native-image testing

[mpeddada1]

This PR adds reflection configuration for native-image testing. Currently running mvn test -Pnative caused ITBigQueryWriteManualClientTest to fail at the native image build step.

Caused by: java.lang.IllegalArgumentException: key v, field private java.lang.Object com.google.api.services.bigquery.model.TableCell.v
       com.google.api.client.json.JsonParser.parseValue(JsonParser.java:900)
       com.google.api.client.json.JsonParser.parse(JsonParser.java:451)
       com.google.api.client.json.JsonParser.parseValue(JsonParser.java:787)
       [...]
     Caused by: java.lang.IllegalArgumentException: unable to create new instance of class java.lang.Object because it has no accessible default constructor
       com.google.api.client.util.Types.handleExceptionForNewInstance(Types.java:162)
       com.google.api.client.util.Types.newInstance(Types.java:117)
       com.google.api.client.util.Data.createNullInstance(Data.java:166)
       com.google.api.client.util.Data.nullOf(Data.java:134)
       com.google.api.client.json.JsonParser.parseValue(JsonParser.java:883)
       [...]
     Caused by: java.lang.InstantiationException: Type `java.lang.Object` can not be instantiated reflectively as it does not have a no-parameter constructor or the no-parameter constructor has not been added explicitly to the native image.
       java.lang.Class.newInstance(DynamicHub.java:915)
       com.google.api.client.util.Types.newInstance(Types.java:113)
       [...]

During native image build, the builder performs static analysis to determine which classes are reachable from the entry-point of the application. Sometimes usages of Java reflection don't get recognized and need to be registered to let the builder know which classes to include in the binary.