[TASK][Timpani-n] Implement timer_create and timer_settime for periodic activation

[LGSI-KarumuriHari]

📝 Task Description

Implement POSIX timer APIs (timer_create, timer_settime) for periodic task activation.

📋 Checklist

• Use timer_create() with CLOCK_MONOTONIC
• Set timer signal (SIGALRM)
• Configure periodic timer with timer_settime()
• Use absolute time (TIMER_ABSTIME) for precision
• Handle timer expiration via signal handler
• Clean up timers with timer_delete()

🔗 Related Requirement

Relates to timer manager implementation
Relates to #27 (Scheduler Logic)

📐 Implementation Guidelines

• Component: timpani-n/System Interface/POSIX Timers
• Create timer: timer_create(CLOCK_MONOTONIC, &sevp, &timerid)
• Set periodic: timer_settime() with it_interval set
• Use TIMER_ABSTIME for absolute time activation
• Handle SIGALRM in signal handler

🧪 Testing Method

• Unit test: Verify timer creation and configuration
• Timing test: Measure timer precision
• Cleanup test: Verify proper timer deletion

[LGSI-KarumuriHari]

@basheerFZ please change this to task ,
I have resued this issue since it is duplicated .