feat: add missing lambda storage slot

Signed-off-by: Ivaylo Nikolov <[email protected]>

Author: ivaylonikolov7

src/hooks/lambda_storage_slot.rs

@@ -0,0 +1,57 @@
+use hedera_proto::services;
+
+use crate::{
+    FromProtobuf,
+    ToProtobuf,
+};
+
+/// A slot in the storage of a lambda EVM hook.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct LambdaStorageSlot {
+    /// The key of the slot.
+    pub key: Vec<u8>,
+
+    /// The value of the slot.
+    pub value: Vec<u8>,
+}
+
+impl LambdaStorageSlot {
+    /// Create a new `LambdaStorageSlot`.
+    pub fn new(key: Vec<u8>, value: Vec<u8>) -> Self {
+        Self { key, value }
+    }
+
+    /// Get the key.
+    pub fn get_key(&self) -> &[u8] {
+        &self.key
+    }
+
+    /// Get the value.
+    pub fn get_value(&self) -> &[u8] {
+        &self.value
+    }
+
+    /// Set the value.
+    pub fn set_value(&mut self, value: Vec<u8>) {
+        self.value = value;
+    }
+
+    /// Set the key.
+    pub fn set_key(&mut self, key: Vec<u8>) {
+        self.key = key;
+    }
+}
+
+impl ToProtobuf for LambdaStorageSlot {
+    type Protobuf = services::LambdaStorageSlot;
+
+    fn to_protobuf(&self) -> Self::Protobuf {
+        services::LambdaStorageSlot { key: self.key.clone(), value: self.value.clone() }
+    }
+}
+
+impl FromProtobuf<services::LambdaStorageSlot> for LambdaStorageSlot {
+    fn from_protobuf(pb: services::LambdaStorageSlot) -> crate::Result<Self> {
+        Ok(Self { key: pb.key, value: pb.value })
+    }
+}