Use `cregistry:ConnectionConfig` type for the schemaRegistryConfig field

[Nuvindu]

Purpose

This is part of the revamping process of the schema registry client: https://github.com/ballerina-platform/ballerina-library/issues/8401

Sample Configuration for kafka:Producer

kafka:ProducerConfiguration config = {
    keySerializerType: kafka:SER_AVRO,
    valueSerializerType: kafka:SER_AVRO,
    keySchema: keySchema,
    valueSchema: schema,
    schemaRegistryConfig: {
        baseUrl:  "https://psrc-8kz20.us-east-2.aws.confluent.cloud",
        auth: {
            apiKey: "MIWUTPVXA5TDX2NI", 
            apiSecret: "D4FGQq7Wqucjbg9c5zGMmqY+sN9g0N2cuZKlvHvow59vMGcUZiqnIkiEEEV+Q08o"
        }
    }
};

Sample Configuration for kafka:Consumer

kafka:ConsumerConfiguration consumerConfiguration = {
    topics: "order",
    offsetReset: kafka:OFFSET_RESET_EARLIEST,
    groupId: "consumer-sasl-scram-256-test-group",
    keyDeserializerType = "DES_AVRO"
    valueDeserializerType = "DES_AVRO"
    schemaRegistryConfig: {
        baseUrl:  "https://psrc-8kz20.us-east-2.aws.confluent.cloud",
        auth: {
            apiKey: "MIWUTPVXA5TDX2NI", 
            apiSecret: "D4FGQq7Wqucjbg9c5zGMmqY+sN9g0N2cuZKlvHvow59vMGcUZiqnIkiEEEV+Q08o"
        }
    }
};

[codecov[bot]]

Codecov Report

:x: Patch coverage is 68.18182% with 7 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 81.68%. Comparing base (eb48260) to head (03994af). :warning: Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
ballerina/listener.bal	33.33%	4 Missing :warning:
ballerina/producer.bal	77.77%	2 Missing :warning:
ballerina/consumer.bal	83.33%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1272      +/-   ##
============================================
+ Coverage     81.65%   81.68%   +0.02%     
- Complexity      502      503       +1     
============================================
  Files            47       47              
  Lines          2562     2571       +9     
  Branches        385      391       +6     
============================================
+ Hits           2092     2100       +8     
- Misses          310      312       +2     
+ Partials        160      159       -1     

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[ayeshLK]

@Nuvindu better to link this to a gitissue and update the changelog. Also lets add a sample code for this PR.