Expose wc_CryptoCb_GetDevice and add CryptoCb API test coverage #587

Job	Run time
smoke (integration, --enable-openssh --enable-lighty --enable-stunnel --enable-opensslextra)	2m 15s
smoke (opensslextra, --enable-opensslextra)	2m 22s
smoke (default)	2m 27s
smoke (leantls-extra, --enable-leantls --enable-session-ticket --enable-sni --enable-opensslextra)	1m 59s
smoke (dtls-suite, --enable-psk --enable-dtls --enable-dtls13 --enable-dtls-mtu --enable-aesccm -...	2m 45s
smoke (enable-all, --enable-all)	4m 15s
smoke (sanitize-asan, --enable-all, -fsanitize=address -fno-omit-frame-pointer -g -O1, -fsanitize...	5m 28s
smoke (cryptonly, --enable-cryptonly)	1m 56s
smoke (enable-all-smallstack, --enable-all --enable-smallstack)	4m 18s
	27m 45s

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