perf: add slots=True to compatible dataclasses

Add slots to dataclasses that don't have class variable access conflicts.
Optimizes memory usage and attribute access speed for Trie, Case, and TestInfo
classes that are frequently instantiated during test execution.

Author: danceratopz

src/ethereum_test_fixtures/collector.py

@@ -18,7 +18,7 @@
 from .file import Fixtures
 
 
-@dataclass(kw_only=True)
+@dataclass(kw_only=True, slots=True)
 class TestInfo:
     """Contains test information from the current node."""
 

src/ethereum_test_tools/code/generators.py

@@ -265,7 +265,7 @@ def __new__(
         return super().__new__(cls, bytecode)
 
 
-@dataclass(kw_only=True)
+@dataclass(kw_only=True, slots=True)
 class Case:
     """
     Small helper class to represent a single, generic case in a `Switch` cases

src/ethereum_test_types/trie.py

@@ -187,7 +187,7 @@ def encode_node(node: Node, storage_root: Optional[Bytes] = None) -> Bytes:
         raise AssertionError(f"encoding for {type(node)} is not currently implemented")
 
 
-@dataclass
+@dataclass(slots=True)
 class Trie(Generic[K, V]):
     """The Merkle Trie."""