Missing call to EqualsTester#testEquals

[cushon]

cc @jackdingilian

The use of EqualsTester added in 25218e8 is incorrect:

java-bigtable/google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/common/TypeTest.java

Lines 123 to 129 in 25218e8

	new EqualsTester()
	.addEqualityGroup(
	StructWithSchema.fromProto(structProto.getStructType()),
	StructWithSchema.fromProto(structProto.getStructType()))
	.addEqualityGroup(
	StructWithSchema.fromProto(complexStructProto.getStructType()),
	StructWithSchema.fromProto(complexStructProto.getStructType()));

There needs to be a terminal call to testEquals() for the equals tester to do anything, that assertion is not currently being run.

This issue was found by https://errorprone.info/bugpattern/MissingTestCall