SchemaRegistryBasicAuthCredentialsSource is missing from SchemaRegistryConfig in 1.0.0-beta2

Description

SchemaRegistryBasicAuthCredentialsSource is missing from SchemaRegistryConfig in 1.0.0-beta2

How to reproduce

Checklist

Please provide the following information:

• Confluent.Kafka nuget version:
• Apache Kafka version:
• Client configuration:
• Operating system:
• Provide logs (with "debug" : "..." as necessary in configuration)
• Provide broker log excerpts
• Critical issue

[mhowlett]

thanks for reporting @prem-aiven-io ! just opened PR #728 to fix this.

[anchitj]

Closing as the fix is merged