Fixed issues in Schema Registry

This section lists the issues that have been fixed since the previous version.

CSP-559: Schema Registry UI occasionally hangs on first use.
CSP-591: Schema Registry Client always requires a key store.
CSP-640: Expose Oracle TLS configurations for Schema Registry and SMM in CM.
CSP-694: Schema Registry UI API URL is incorrect.
CSP-702: Realign checksum for SQL migration scripts before spinning up SMM or Schema Registry.
CSP-763: SchemaRegistryClient class does not support Knox proxy or the SSL cert file for HTTPS.
CSP-768: SchemaRegistryClient class should support Knox proxy.
CSP-771: The Hikari version has been updated.
CSP-773: Schema Registry REST API is not accessible through Knox proxy with basic authorization.
CSP-774: Error when creating a schema in Schema Registry with field that is nullable but with default value.