Support sql created named collections in Kafka Storage for librdkafka settings

[GrigoryPervakov]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Unify xml and sql created named collection behaviour in kafka storage.

Kafka storage have two types of parameters: storage parameters iteself and settings that would be passed to librdkafka.
Before changes storage paramets applied in both cases, but kafka settings loaded only if named collection was created with xml config.
Changes unifies named collection access and as a bonus allows use new xml named collection without server restart.

Example:
Consider following config

<clickhouse>
    <named_collections>
        <kafka_config_xml>
            <kafka_broker_list>kafka:19092</broker_list>
            <kafka_topic_list>topic_name</kafka_topic_list>
            <kafka_group_name>group</kafka_group_name>
            <kafka_format>JSONAsString</kafka_format>
            <kafka>
                <security_protocol>SASL_SSL</security_protocol>
                <sasl_mechanisms>'SCRAM-SHA-512</sasl_mechanisms>
                <sasl_username>username</sasl_username>
                <sasl_password>primary_secret_password</sasl_password>
            </kafka>
        </kafka_config_xml>
    </named_collections>
</clickhouse>

And queries like

CREATE NAMED COLLECTION kafka_config_sql AS
    kafka.security_protocol = 'SASL_SSL',
    kafka.sasl_mechanism = 'SCRAM-SHA-512',
    kafka.sasl_password = 'pswd',
    kafka.sasl_username = 'username
            
    kafka_broker_list = 'kafka:19092',
    kafka_topic_list = 'topic_name',
    kafka_group_name = 'group',
    kafka_format = 'JSONAsString'

CREATE TABLE test.kafka_sql (field String) ENGINE = Kafka(kafka_config_sql);
CREATE TABLE test.kafka_xml (field String) ENGINE = Kafka(kafka_config_xml);

Before changes table kafka_sql would not apply first 4 settings and would be unable to auth.
And also it wouldn't read default config, because of specified named collection, so right now kafka storage with sql created named collection is almost not configurable.

[CLAassistant]

All committers have signed the CLA.

[myrrc]

LGTM

[robot-ch-test-poll3]

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