Tweak Kafka reader and dialer config

[jeremy5189]

No description provided.

[Copilot]

Pull Request Overview

This PR makes Kafka reader and dialer configuration more flexible by externalizing previously hardcoded timeout and buffer size values. The changes allow these parameters to be configured via the YAML configuration file rather than being fixed in the code.

Key changes:

• Replaces hardcoded Kafka dialer timeout (10s) and adds configurable keep-alive setting
• Makes Kafka reader buffer sizes (MinBytes, MaxBytes) and MaxWait timeout configurable
• Adds logging to track the configured Kafka reader parameters at startup

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
internal/config.go	Adds five new configuration fields for Kafka reader and dialer settings
internal/kafka.go	Updates dialer and reader initialization to use config values instead of hardcoded constants; adds logging for configuration visibility
banjax-config.yaml	Defines default values for the new Kafka configuration parameters

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