sample(openssl-hook): use LD_PRELOAD hook openssl lib to support ra…

…ts-rs anywhere use openssl

1. add useful api to rats-rs/crypto module. export rats-rs/crypto
module, some openssl fundamental variable to openssl-hook.
2. add openssl-hook sample, check the README.md for more
information.

examples/openssl_hook/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "openssl_hook"
+edition.workspace = true
+version.workspace = true
+readme.workspace = true
+license.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+ctor = "0.2.8"
+log = {workspace = true}
+env_logger = {workspace = true}
+libc = "0.2"
+anyhow = {workspace = true}
+lazy_static = "1.5"
+rats-rs = {path = "../../rats-rs", features = ["is-sync"]}