This patch adds `extern "C"` linkage directives so the header files can
be included by C++ source files.
Signed-off-by: Markus Fuchs <markus.fuchs@de.sauter-bc.com>
move zephyr/jwt.h to data/jwt.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>