add a simple benchmark with concurrency

bench-cargo-miri/serde2/Cargo.lock

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bench-cargo-miri/serde2/Cargo.toml

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+[package]
+name = "cargo-miri-test"
+version = "0.1.0"
+authors = ["Oliver Schneider <git-spam-no-reply9815368754983@oli-obk.de>"]
+edition = "2018"
+
+[dependencies]
+serde = { version = "*", features = ["derive"] }
+serde_json = "*"