⭐ feat: protobuf input messaging (#165)

Replace json protocol by protobuf
generate protobuf files with `bun buf generate` or just `buf generate`

- [x]  Implement all datatypes with proto files

- [x] Map to ts types or use the generated proto types directly with:
   - [x] web frontend
   - [x] relay
   - [x] runner

- [ ] final performance test (to be done when CI builds new images)

---------

Co-authored-by: DatCaptainHorse <DatCaptainHorse@users.noreply.github.com>

protobufs/latency_tracker.proto

@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+import "google/protobuf/timestamp.proto";
+
+option go_package = "relay/internal/proto";
+
+package proto;
+
+message ProtoTimestampEntry {
+  string stage = 1;
+  google.protobuf.Timestamp time = 2;
+};
+
+message ProtoLatencyTracker {
+    string sequence_id = 1;
+    repeated ProtoTimestampEntry timestamps = 2;
+}