Add Group Support for IncrementalAlterConfigs API

[PratRanj07]

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This PR intends to add support for Group Resource type for IncrementalALterConfigs API as specified in KIP 848. Additional changed the integration test to check for Group Resource Type.

[confluent-cla-assistant[bot]]

:tada: All Contributor License Agreements have been signed. Ready to merge.
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[pranavrth]

do_test_DescribeConfigs is failing. Please check and fix the test.