Add build option to reserve internal RAM for IDF allocation

[josesimoes]

Description

• Add CMake build option ESP32_RESERVED_RAM_FOR_IDF_ALLOCATION.
• Update CMake and ESP32 target platform accordingly.
• Update memory allocation define.
• Update CmakePresets for all PICO and Ethernet targets to reserve 10k of internal RAM.

Motivation and Context

• Exposes option to reserve RAM for IDF allocation.
• This has come up in the review of PR Increase reserved memory for IDF #2456 which was fixing Exception with WiFi ScanAsync Home#1166.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dev Containers (changes related with Dev Containers, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).

[AdrianSoundy]

The builds are failing because its not finding the default value of ESP32_RESERVED_RAM_FOR_IDF_ALLOCATION (0)
So we get

C:/nanof/nf-interpreter/build/targets/ESP32/ESP32/target_platform.h:13:47: error: 'OFF' was not declared in this scope
[build]  #define ESP32_RESERVED_RAM_FOR_IDF_ALLOCATION OFF

You have
option( ESP32_RESERVED_RAM_FOR_IDF_ALLOCATION "Reserved RAM for IDF allocation (in kBytes)" 0)
in esp32\CmakeLists.txt
So not sure why it's not working

[AdrianSoundy]

Other than changes above looks good to me,