Optimize Timer instance creation in SimpleTimerCapture

[MozirDmitriy]

• Add thread-safe Timer instance caching using ConcurrentHashMap
• Implement getOrCreateTimer() method for Timer instance reuse
• Modify captureTime methods to use cached Timer instances
• Remove TODO comment as the improvement has been implemented

This change improves performance by reducing the number of Timer instances created and reusing existing ones from a thread-safe cache.

This PR implements issue(s) # N/A

Checklist

• I wrote new tests for my new core changes.
• I have successfully ran tests, style checker and build against my new changes locally.
• I have informed the team of any breaking changes if there are any.

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