'idf_tools.py add-version' has new options:
--override Override tool versions with new data
--checksum-file URL or path to local file with checksum/size for artifacts
Usage e.g.:
CHECKSUM_URL=https://github.com/espressif/crosstool-NG/releases/download/esp-2021r2/crosstool-NG-esp-2021r2-checksum.sha256
idf_tools.py add-version --tool xtensa-esp32-elf --version esp-2021r2 --override --checksum-file $CHECKSUM_URL
Positional argument 'files' moved to optional argument '--artifact-file'
Add tests for add-version logic
