feat: Added translation unit for synced enforcer

[EmperorYP7]

Signed-off-by: Yash Pandey (YP) yash.btech.cs19@iiitranchi.ac.in

This PR fixes #38

Reference: #90

Description

Most of the functions of SyncedEnforcer were straight-forward to implement but the AutoLoadPolicy needed a workaround since it utilized GoLang's ticker from the "time" module and concurrency. For this, I created a custom concurrent ticker that takes in the duration and a function<void()> for a callback. Then passed in the following to callback of ticker which is called at every tick:

[this]() {
    Enforcer::LoadPolicy();
    ++n;
};

Note that n is an atomic_int which is thread-safe.
When StopAutoLoad() is called, the ticker stops all worker threads deployed by the ticker. However, this won't destroy the instance of the ticker. I also created test files to verify everything is implemented correctly. (The test policy won't change in real-time during a test)

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Tasks remaining

BatchEnforcer, BatchWithMatcher yet to be implemented in Enforcer.
UpdatePolicy, UpdateNamedPolicy, UpdatePolicies and UpdateNamedPolicies yet to be implemented in Enforcer.
UpdateGroupingPolicy, UpdateNamedGroupingPolicy yet to be implemented in Enforcer.
I'll implement this in another PR.

[hsluoyz]

@xcaptain

[xcaptain]

Looks good to me, would be better you provide some tests so I can test the code. you can provide the tests in the next pull request if you want.

[github-actions]

🎉 This PR is included in version 1.15.0 🎉

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