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Contribution description
This PR is a split-off from PR #17841. It adds the basic structure for an API which is used for ESP-IDF types and functions that are required by RIOT-OS but cannot be included directly due to naming conflicts.
For this purpose, the header files of this API declare the types and functions that are required from the ESP-IDF, but without using the ESP-IDF header files to avoid conflicting names. The implementation of the API then uses the ESP-IDF. In most cases, simple wrapper functions are sufficient.
Testing procedure
Since the basic structure of the API contains almost no functionality, a green CI is sufficient.
Issues/PRs references
Split-off from PR #17841