feat: Distributed Log Replay serialization/deserialization (delta-io#1503)

## What changes are proposed in this pull request?
This PR introduces serialization and deserialization for the
ScanLogReplayProcessor.
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This PR adds serialization and deserialization for LogReplayProcessor.  

## How was this change tested?
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Round trip test is performed with the LogReplayProcessor. Invalid
internal state is expected to result in an error.

Author: OussamaSaoudi

kernel/src/log_replay.rs

@@ -26,8 +26,8 @@ use tracing::debug;
 
 /// The subset of file action fields that uniquely identifies it in the log, used for deduplication
 /// of adds and removes during log replay.
-#[derive(Debug, Hash, Eq, PartialEq, Clone)]
-pub(crate) struct FileActionKey {
+#[derive(Debug, Hash, Eq, PartialEq, serde::Serialize, serde::Deserialize, Clone)]
+pub struct FileActionKey {
     pub(crate) path: String,
     pub(crate) dv_unique_id: Option<String>,
 }