Python property names should be snake case

[samwelkanda]

After recent changes to consolidate naming in refiners, some python properties are not conforming to snake case naming convention e.g BackingStore, OdataType

@dataclass
class PublishPostRequestBody(AdditionalDataHolder, BackedModel, Parsable):
    # Stores model information.
    BackingStore: BackingStore = field(default_factory=BackingStoreFactorySingleton(backing_store_factory=None).backing_store_factory.create_backing_store, repr=False)