This commit adds a copy of upstream vanilla FreeRTOS uncrustify.cfg files from
the following upstream commit:
https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/89e4823a49aef546b0898282523d9490cea5524d
Note: "pp_indent_brace" is commented out as that was enabled after v10.4.3
Also also added a note in the ESP-IDF style guide aobut formatting FreeRTOS
source code using Uncrustify.
Darian Leung