test: establish initial performance benchmark suite

[AKonnyaku]

This pr establishes the initial performance benchmarking infrastructure for node-casbin.

• it creates a new benchmark directory with dedicated typescript test cases.
• the suite covers core components including enforcer and role manager.
• it allows developers to measure execution time locally using ts-node.
• this sets up the necessary code foundation for future ci integration.

[coveralls]

Pull Request Test Coverage Report for Build 20967765248

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 78.612%

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Totals
Change from base Build 20878530147:	0.0%
Covered Lines:	1711
Relevant Lines:	2069

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💛 - Coveralls