BREAKING CHANGES:
- New API for PSK security credentials, unified with
  avs_crypto_security_info_union_t

Features:
- Added support for Mbed TLS 3.1
- Added support for using PSK security credentials through hardware security
  engines
- Added API for uploading software-based private keys onto hardware security
  engines

Improvements:
- Added a AVS_COMMONS_WITHOUT_TLS macro public for easier checking of (D)TLS
  support
- Stopped using LOG macro in expression context for better compatibility with
  external logger implementations
- Lowered log level of the "scheduler already shut down" as that is not really
  a fatal condition

Bugfixes:
- Failure to load DANE credentials if DANE is enforced is now properly a fatal
  error in OpenSSL backend
- Fixed support for PEM-formatted certificates and CRLs in Mbed TLS backend