Fix all Doxygen errors and make any future errors fatal (#118) ...

* Start working on fixing doxygen warnings

* Upgrade doxyfile to Doxygen 1.9.1

* Clean up some unmatched groups and add some exclusions

* Fix docs for rtos::ThisThread not showing up

* Fix up KV store docs

* Fix incorrect @files, some more incorrect groups

* Fix lots of broken links

* Start fixing mbedtls groups

* Fix more mbedtls docs

* Fix remaining mbedtls files with missing or incorrect grouping

* Fix a huge amount of PSA docs errors

* Fix a few more mbedtls docs errors

* Fix __cplusplus not defined for docs, clean up call in callback typedef, fix some docs errors

* Fix some broken doc links in HAL headers

* Fix more PSA doc errors

* Fix some doxygen errors in networking code

* Fix lots of network related doc errors

* Try and fix some CI failures

* Use Doxygen Action instead of doxygen in Mbed container to get the right version

* Try removing docs check

* Add first part of doxygen action

* Add next part of doxygen action

* Fix yaml syntax error

* Add in license check fix

* Try using verbose scancode

* Fix some more docs issues, workaround scancode-toolkit#3179

* Clean up the LoRaRadio get_state() function on each implementation.  Also fix some other compile and doc errors.

* Fix all remaining doxygen errors

* Fix escaping, for realsies this time

* Remove Doxygen unsupported config options, fix some more get_status() declarations

* Fix some UNITTESTS build errors

* Fix one more compile error

* Another unittest error

Fix ABI differences between mbed-baremetal and mbed-os, remove PlatformMutex

Convert storage/ targets into STATIC libraries

"kvstore_global_api" requires "kvstore" for backward compatibility ...

PR #13908 replaces the umbrella library for all KVStore from
"kvstore_global_api" to "kvstore". Now "kvstore_global_api"
still exists but is restricted to the global API part only.

By adding "kvstore" as a dependency of "kvstore_global_api",
existing bare metal projects (e.g. mbed-bootloader) that use
the latter library name to pull in the KVStore prototype class
will continue to work.

KVStore: drop './' from CMake paths

KVStore: componentize CMake definitions into sub-components

Create a kvstore_global_api for the global API and KVMap