Prepackage MySQL JDBC connector in Docker images via a downloadable link

[chirangaalwis]

Description:
Currently in Dockerfiles, it is instructed to include the MySQL JDBC connector using a Dockerfile COPY instruction [1]. It could be instructed to include the MySQL JDBC connector via a downloadable link (available from Maven Central) using the Dockerfile ADD construct.

[1]: COPY instruction

Affected Product Version:
Docker resources for WSO2 Stream Processing v4.4.x and below

Sub Tasks:

• Improved in Alpine based Docker resources
• Improved in CentOS based Docker resources
• Improved in Ubuntu based Docker resources
• Code/Peer review