added example project for porting of freertos to stm32u545re mcu

[yaswanthksas]

Added STM32U545RE ported version of FreeRTOS bring-up example (Cortex-M33)

Description

1. This example demonstrates two tasks are running one after other.
2. sucessful porting of freeRTOS to stm32u545re mcu.
3. changed systick handler, pendsv handler, svc handler configurable to cortex m33.

Test Steps

1. two tasks are running one after other with round robin fashion and by changing priority of one of the task can make premptive priority fashion.
   Architecture view:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud