feat: add support for keymatch5 function

[mikyll]

I added the support for keymatch5, based on Casbin (Go) implementation, with related tests 👀

Fixes #153

KeyMatch5 function ported from: casbin/casbin/util/builtin_operators.go
Tests ported from: casbin/casbin/util/builtin_operators_test.go

[mikyll]

@hsluoyz the CI issue seems to be related to leafo/gh-actions-lua@v8.0.0 GitHub action...

Some insight: leafo/gh-actions-lua#49

From LuaJIT website:

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[hsluoyz]

@mikyll how to fix it? Is there any decision that requires me to make? Like there are solution A and solution B. The good and bad points of A are balabala, the good and bad points of B are balabala. Make your choice, something like this

[mikyll]

@hsluoyz sorry for the delay, I opened a new issue and provided a possible solution. If that's ok I can open a new PR that fixes the CI issue (I've already tested the workflow on a fork and it appears to be working)

[github-actions]

🎉 This PR is included in version 1.43.0 🎉

The release is available on GitHub release

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