Adds support for missing Olimex boards (espressif#8896)

* Board variant ESP32-C3-DevKit-Lipo

Added board variant for Olimex ESP32-C3-DevKit-Lipo

* Board variant ESP32-C6-EVB

Added board variant for Olimex ESP32-C6-EVB

* Board variant ESP32-S2-DevKit-Lipo-USB

Added board variant for Olimex ESP32-S2-DevKit-Lipo-USB

* Board variant ESP32-S2-DevKit-Lipo

Added board variant for Olimex ESP32-S2-DevKit-Lipo

* Board variant ESP32-S3-DevKit-Lipo

Added board variant for Olimex ESP32-S3-DevKit-Lipo

* Added Olimex boards in the board.txt files

Added missing Olimex boards:

ESP32-S2-DevKit-Lipo
ESP32-S2-DevKit-Lipo-USB
ESP32-S3-DevKit-Lipo
ESP32-C3-DevKit-Lipo
ESP32-C6-EVB

Added additional upload speed options to the ESP32-EVB and ESP32-POE(-ISO) boards.

* Update

Made changes on the definitions of the pins and formatting as suggested.

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Co-authored-by: Jan Procházka <90197375+P-R-O-C-H-Y@users.noreply.github.com>

Author: Stanimir-Petev