feat: Add new methods to ChargingManager (#580)

Add `get_charged_event_count` and `get_max_total_charge_usd` methods,
which are already available in SDK JS, but are missing here.

Author: vdusek

src/apify/_charging.py

@@ -64,6 +64,16 @@ def get_pricing_info(self) -> ActorPricingInfo:
         This can be used for instance when your code needs to support multiple pricing models in transition periods.
         """
 
+    def get_charged_event_count(self, event_name: str) -> int:
+        """Get the number of events with the given name that were charged so far.
+
+        Args:
+            event_name: Name of the inspected event.
+        """
+
+    def get_max_total_charge_usd(self) -> Decimal:
+        """Get the configured maximum total charge for this Actor run."""
+
 
 @docs_group('Charging')
 @dataclass(frozen=True)
@@ -309,6 +319,15 @@ def get_pricing_info(self) -> ActorPricingInfo:
             },
         )
 
+    @ensure_context
+    def get_charged_event_count(self, event_name: str) -> int:
+        item = self._charging_state.get(event_name)
+        return item.charge_count if item is not None else 0
+
+    @ensure_context
+    def get_max_total_charge_usd(self) -> Decimal:
+        return self._max_total_charge_usd
+
 
 @dataclass
 class ChargingStateItem: