WIP: feature(arch): Build system integration for ARM architecture

[Priyadharshiniprabhakaran]

• Added FreeRTOS Kernel as a submodule
• Added LWIP stack into deps folder
• Created an example called freertos_main.c which contains the FreeRTOS example
• The current integration will work for ARM_CM33 Processor boards - Specifically validated the application execution on STM32 boards - Yet to test the Client Server interaction
• TODO:
  • Move FreeRTOS Kernel into deps folder
  • Add LWIP as a submodule
  • Rebase to the latest version of master
  • Have to make changes to cmake files to build specific examples alone for FreeRTOS

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[jpfr]

Nice! For starters, please sign the CLA in this PR and also use lwip from a git submodule.
This will greatly redu en the size of the PR.

Theo we will have closer look and help you getting this merged.