Add engine bindings

[SercanKaraoglu]

Draft GitHub PR for adding OpenSSL engine support:

Allow using OpenSSL engines

This PR adds the ability to load and use OpenSSL engines for hardware acceleration and offloading of crypto operations.

Some of the key functionality we want to implement is:

• Load builtin OpenSSL engines
• Register all engines
• Load an engine by ID (e.g. "dynamic")
• Control the engine by passing command strings
• Set engine parameters (e.g. SO path)
• Initialize and add the engine
• Set as the default engine
• Get engine name and ID

Benefits:
Hardware acceleration of crypto workloads
Leverage optimizations in OpenSSL engines
Improve performance of cryptography

This enables tapping into OpenSSL engines like the QuickAssist engine for hardware accelerated cryptography.

Usage example:

let _ = Engine::load_builtin_engines(); 
let _ = Engine::register_all_complete();
let mut e = Engine::by_id("dynamic").unwrap();
println!("cmd so path: {}", e.ctrl_cmd_string("SO_PATH", "/opt/openssl/1.1.1e/lib/engines-1.1/qatengine.so", 0).unwrap());
println!("cmd load {}", e.load().unwrap());
println!("init = {}", e.init().unwrap());
println!("add = {}", e.add().unwrap());
println!("cmd set default {}", e.set_default(0xFFFF).unwrap());
println!("name={}, id={}", e.get_name().unwrap(), e.get_id().unwrap());