0.3.0 - Headers and Handlebars

This fork/release contains following changes:

• Add handlebars support. This helps generate/maintain payload in a easier way by generating random values, dates, integers, doubles, encode decode string in base64 and urlencoded formats. Some of the functionalities can be handled by JMeter functions as well, however handlebars allow creation of templates which are more easy to maintain. Handlebars can be used with message, key and headers(key and value)
• Add ability to add headers. Additional argument ${kafka_headers} in the Sampler "form", that takes in header and its value in a query string format. e.g. header1=value1&header2=value2. Supports handlebars.
• Replace jorphan with slf4j logger. Fixes deprecation warning with latest versions of jmeter.

NOTE: Attached JAR uses:

• kafka-client v3.0.0
• jmeter v5.0
• Java 11

Clone and build with different versions by updating pom.xml