[EventHub] fix pylint plugin errors (Azure#23977)

fix new pylint rules:
- C4747: enum-must-inherit-case-insensitive-enum-meta
- C4748: client-accepts-api-version-keyword

Author: swathipil

sdk/eventhub/azure-eventhub/azure/eventhub/_consumer_client.py

@@ -31,7 +31,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-class EventHubConsumerClient(ClientBase):
+class EventHubConsumerClient(ClientBase):   # pylint: disable=client-accepts-api-version-keyword
     """The EventHubConsumerClient class defines a high level interface for
     receiving events from the Azure Event Hubs service.
 

sdk/eventhub/azure-eventhub/azure/eventhub/_producer_client.py

@@ -37,7 +37,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-class EventHubProducerClient(ClientBase):
+class EventHubProducerClient(ClientBase):   # pylint: disable=client-accepts-api-version-keyword
     # pylint: disable=too-many-instance-attributes
     """The EventHubProducerClient class defines a high level interface for
     sending events to the Azure Event Hubs service.

sdk/eventhub/azure-eventhub/azure/eventhub/aio/_consumer_client_async.py

@@ -36,7 +36,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-class EventHubConsumerClient(ClientBaseAsync):
+class EventHubConsumerClient(ClientBaseAsync):  # pylint: disable=client-accepts-api-version-keyword
     """The EventHubConsumerClient class defines a high level interface for
     receiving events from the Azure Event Hubs service.
 

sdk/eventhub/azure-eventhub/azure/eventhub/aio/_producer_client_async.py

@@ -41,7 +41,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-class EventHubProducerClient(ClientBaseAsync):
+class EventHubProducerClient(ClientBaseAsync):  # pylint: disable=client-accepts-api-version-keyword
     # pylint: disable=too-many-instance-attributes
     """
     The EventHubProducerClient class defines a high level interface for

sdk/eventhub/azure-eventhub/azure/eventhub/amqp/_constants.py

@@ -6,9 +6,10 @@
 from enum import Enum
 
 from uamqp import MessageBodyType
+from azure.core import CaseInsensitiveEnumMeta
 
 
-class AmqpMessageBodyType(str, Enum):
+class AmqpMessageBodyType(str, Enum, metaclass=CaseInsensitiveEnumMeta):
     DATA = "data"
     SEQUENCE = "sequence"
     VALUE = "value"