add_dependencies early in build (IDFGH-13540) (PACMAN-981)

[malachib]

Answers checklist.

• [X] I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• [X] I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• [X] I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I am working on a yaml generator. Its purpose is to work around the lack of local components ability to specify their own idf_component.yml.

It is working pretty well, but runs too late in the process. Although it runs before the components themselves are compiled, it runs after the component manager evaluates idf_component.yml.

It's very useful to run in the context of ESP-IDF build so that things like EXTRA_COMPONENT_DIRS is available.

Is there a way to add_dependencies such that my custom target is picked up by idf build early on, before managed components are evaluated?