Update schema_registry.go

[oscar067]

When calling to retrieve the schemaInfo the library github.com/riferrei/srclient v0.5.4 calls this code which calls to Rlock, creating a performance problem in the library, the following code is a workaround to avoid calling to that cache always

// RLock locks rw for reading.
//
// It should not be used for recursive read locking; a blocked Lock
// call excludes new readers from acquiring the lock. See the
// documentation on the RWMutex type

func (client *SchemaRegistryClient) getVersion(subject string, version string) (*Schema, error) {

	if client.getCachingEnabled() {
		cacheKey := cacheKey(subject, version)
		client.subjectSchemaCacheLock.RLock()
		cachedResult := client.subjectSchemaCache[cacheKey]
		client.subjectSchemaCacheLock.RUnlock()
		if cachedResult != nil {
			return cachedResult, nil
		}
	}

[sonarqubecloud]

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[oscar067]

reviewed and accepted changes!

[mostafa]

@oscar067
After merging #149, I found conflicts here. I fetched the changes to solve the conflicts, but there are too many changes. So, I created #151 to address the issue while considering what @riferrei suggested.

[mostafa]

I'll close this in favor of #151.