The current logger category assignments are inconsistent and, in some cases, overly broad.

Example 1: There are logs related to work item processing under the Microsoft.DurableTask category, making them hard to filter out without also filtering out more useful logs under this prefix. There are event some gRPC logs under this category, whereas they should probably exist under Microsoft.DurableTask.*.Grpc.

These changes should be considered as breaking changes since users may have queries that check for specific logging categories (rather than prefixes).