Initial reporting of the cipher provider version

Execute PRAGMA cipher_provider_version;

Supports OpenSSL, libtomcrypt, and
common crypto when running on OS X

src/sqlcipher.h

@@ -56,6 +56,7 @@ typedef struct {
   int (*ctx_init)(void **ctx);
   int (*ctx_free)(void **ctx);
   int (*fips_status)(void *ctx);
+  const char* (*get_provider_version)(void *ctx);
 } sqlcipher_provider;
 
 /* utility functions */