add solana explorer subtreams

solana-explorer/proto/block_meta.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package sol.block_meta.v1;
+
+message BlockMeta {
+  uint64 slot = 1;
+  string hash = 2;
+  string parent_hash = 3;
+}

solana-explorer/proto/program_instructions.proto

@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package sol.programs.v1;
+
+message Instructions {
+  repeated Instruction instructions = 1;
+}
+
+message Instruction {
+  string program_id = 1;
+  repeated string accounts = 2;
+  string data = 3;
+
+  uint64 slot_number = 4;
+  string block_hash = 5;
+}