This organizes all public headers for the library into
include/ and makes sure then don't rely on any headers from
other folders.
To accomplish this, this change also refactors macros.h,
media/base/macros.h, and status/status_macros.h into macros/classes.h,
macros/compiler.h, macros/crypto.h, macros/logging.h, macros/status.h,
and public/export.h. Now the export macros from macros.h live in
include/ to keep include/ from requiring anything else.
This refactor enables an install target that includes public headers
only.
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Co-authored-by: Cosmin Stejerean <cstejerean@meta.com>