Feature: Added sled store example based on rocks example

Cargo.toml

@@ -1,3 +1,3 @@
 [workspace]
-members = ["openraft", "memstore", "rocksstore"]
-exclude = ["examples/raft-kv-memstore", "examples/raft-kv-rocksdb"]
+members = ["openraft", "memstore", "rocksstore", "sledstore"]
+exclude = ["examples/raft-kv-memstore", "examples/raft-kv-rocksdb"]

sledstore/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "sledstore"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sled = "0.34.7"
+byteorder = "1.4.3"
+serde = { version = "1.0.114", features = ["derive"] }
+serde_json = "1.0.57"
+openraft = { version = "0.6", path = "../openraft", features = ["serde"] }
+async-std = { version = "1.12.0", features = ["attributes", "tokio1"] }
+tracing = "0.1.29"
+tracing-futures = "0.2.4"
+
+[dev-dependencies]
+tempdir = "*"
+async-trait = "*"