v0.15.0

• Upgrade to Go 1.21
• Add option to orphan resources. Thanks to @atarax
• Fix ServiceIntegration: do not send empty user config to the API
• Add a format for string type fields to the documentation
• Generate CRDs changelog
• Add Clickhouse field userConfig.private_access.clickhouse_mysql, type boolean: Allow clients
  to connect to clickhouse_mysql with a DNS name that always resolves to the service's private IP addresses
• Add Clickhouse field userConfig.privatelink_access.clickhouse_mysql, type boolean: Enable clickhouse_mysql
• Add Clickhouse field userConfig.public_access.clickhouse_mysql, type boolean: Allow clients to
  connect to clickhouse_mysql from the public internet for service nodes that are in a project VPC
  or another type of private network
• Add Grafana field userConfig.unified_alerting_enabled, type boolean: Enable or disable Grafana
  unified alerting functionality
• Add Kafka field userConfig.aiven_kafka_topic_messages, type boolean: Allow access to read Kafka
  topic messages in the Aiven Console and REST API
• Add Kafka field userConfig.kafka.sasl_oauthbearer_expected_audience, type string: The (optional)
  comma-delimited setting for the broker to use to verify that the JWT was issued for one of the
  expected audiences
• Add Kafka field userConfig.kafka.sasl_oauthbearer_expected_issuer, type string: Optional setting
  for the broker to use to verify that the JWT was created by the expected issuer
• Add Kafka field userConfig.kafka.sasl_oauthbearer_jwks_endpoint_url, type string: OIDC JWKS endpoint
  URL. By setting this the SASL SSL OAuth2/OIDC authentication is enabled
• Add Kafka field userConfig.kafka.sasl_oauthbearer_sub_claim_name, type string: Name of the scope
  from which to extract the subject claim from the JWT. Defaults to sub
• Change Kafka field userConfig.kafka_version: enum [3.1, 3.3, 3.4, 3.5] → [3.1, 3.3, 3.4, 3.5, 3.6]
• Change Kafka field userConfig.tiered_storage.local_cache.size: deprecated
• Add OpenSearch field userConfig.opensearch.indices_memory_max_index_buffer_size, type integer:
  Absolute value. Default is unbound. Doesn't work without indices.memory.index_buffer_size
• Add OpenSearch field userConfig.opensearch.indices_memory_min_index_buffer_size, type integer:
  Absolute value. Default is 48mb. Doesn't work without indices.memory.index_buffer_size
• Change OpenSearch field userConfig.opensearch.auth_failure_listeners.internal_authentication_backend_limiting.authentication_backend:
  enum [internal]
• Change OpenSearch field userConfig.opensearch.auth_failure_listeners.internal_authentication_backend_limiting.type:
  enum [username]
• Change OpenSearch field userConfig.opensearch.auth_failure_listeners.ip_rate_limiting.type: enum [ip]
• Change OpenSearch field userConfig.opensearch.search_max_buckets: maximum 65536 → 1000000
• Change ServiceIntegration field kafkaMirrormaker.kafka_mirrormaker.producer_max_request_size: maximum
  67108864 → 268435456