Implement asio-ssl layer with three classes in asio::ssl::mbedtls:
* context -- replaces SSL_CTX, used mainly as a container to options,
certs, keys
* engine -- replaces SSL, implements the actual mbedtls operations
* bio -- implements openssl BIO specifically tailered to mbedtls and
its asio usage
Further updates:
* asio: Used shared_ptr<> for bio pairs
* asio: Add error checks to mbedtls-bio
* asio: Address potential ssl-context ownership issue
* asio: Address potential bio-engine ownership issue
* Original commit: espressif/esp-idf@d823106aa6
Apply the pre-commit hook whitespace fixes to all files in the repo.
(Line endings, blank lines at end of file, trailing whitespace)
* Original commit: espressif/esp-idf@66fb5a29bb
