fix: Fix Testing and Implementation

Signed-off-by: aceppaluni <aceppaluni@gmail.com>

Author: aceppaluni

src/hiero_sdk_python/fees/fee_estimate.py

@@ -16,8 +16,7 @@ class FeeEstimate:
     """Represents a fee estimate composed of a base amount and optional extras."""
 
     base: int
-    # extras: list[FeeExtra] = field(default_factory=list)
-    extras: tuple[FeeExtra, ...] = field(default_factory=tuple)
+    extras: list[FeeExtra] = field(default_factory=list)
 
     def __post_init__(self) -> None:
         object.__setattr__(self, "extras", tuple(self.extras))

src/hiero_sdk_python/fees/fee_estimate_response.py

@@ -6,7 +6,7 @@
 
 from __future__ import annotations
 
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 
 from hiero_sdk_python.fees.fee_estimate import FeeEstimate
 from hiero_sdk_python.fees.fee_estimate_mode import FeeEstimateMode
@@ -21,5 +21,5 @@ class FeeEstimateResponse:
     network_fee: NetworkFee | None = None
     node_fee: FeeEstimate | None = None
     service_fee: FeeEstimate | None = None
-    notes: list[str] = field(default_factory=list)
     total: int = 0
+    high_volume_multiplier: int = 0