Add library context and property query support into the PKCS12 API

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/14434)

crypto/pkcs7/pk7_local.h

diff --git a/crypto/pkcs7/pk7_local.h b/crypto/pkcs7/pk7_local.h
index 177ecc1..8deb342 100644
--- a/crypto/pkcs7/pk7_local.h
+++ b/crypto/pkcs7/pk7_local.h
@@ -12,3 +12,5 @@
 const PKCS7_CTX *ossl_pkcs7_get0_ctx(const PKCS7 *p7);
 OSSL_LIB_CTX *ossl_pkcs7_ctx_get0_libctx(const PKCS7_CTX *ctx);
 const char *ossl_pkcs7_ctx_get0_propq(const PKCS7_CTX *ctx);
+
+int ossl_pkcs7_ctx_propagate(const PKCS7 *from, PKCS7 *to);