Schema registry for data governance

**Title:** `Schema registry for data governance`

**Description:**
Support for schema evolution and validation.

**Proposed Solution:**
```java
SchemaRegistry registry = client.schemaRegistry();
int schemaId = registry.register("topic-value", avroSchema);
Schema schema = registry.getLatestSchema("topic-value");
```

The issue does not name any files, tests, or entry points. Start by locating the client and messaging-schema components, then determine the intended scope for schema registration, evolution, and validation; done criteria are not specified in the issue.

Written by the indexing model from the issue text.