RefreshLatestSchemaMetadataCache implementation refreshing latestToSchemaCache entries

[nicolaspastorbueno-yape]

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RefreshLatestSchemaMetadataCache implementation refreshing latestToSchemaCache entries Issue #1274

Why?: in order to allow refresh the internal state of cache that belongs to, the first time that GetLatestSchemaMetadata method is executed (client#latestToSchemaCache) or when the ttl cache is exired

Implementation:

• RefreshLatestSchemaMetadataCache method implementation into schemaregistry_client.go, assuming variadic string with subjects arguments, iterating it and getting the schema-metadata for each one
• by each schema-metadata, when it call occurs and get the schema-metadata into &SchemaMetadata
  • lock latestToSchemaCacheLock for possible R/W ah update latestToSchemaCache internal-state
  • when an error occurs when calling schema-metadata obtention, it puts in a multierror and returns the possible errors to be aware about this behavior

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[nicolaspastorbueno-yape]

Closed in favor of https://github.com/confluentinc/confluent-kafka-go/pull/1305