This commit introduces the `BenchmarkService` class, which encapsulates API calls related to benchmarking operations. The class includes two methods:
1. `generateReport`: Takes a `ReportRequestBody` object as input and performs a POST request to the `/reports` URL, serializing the object to JSON format.
2. `pollUpdates`: Accepts a UNIX UTC timestamp as an argument and performs a GET request to the `/updates?last_update_time=<timestamp>` URL.
Both methods use the `RestApiUtility` for making HTTP requests and are designed to work with different base URLs, controlled by the `ApiType` enum.
