Flink CDC SQL Server example

[nicusX]

Purpose of the change

New example using Flink CDC with SQL Server

Verifying this change

Run locally with databases in Docker
Run on AWS with RDS

Significant changes

(Please check any boxes [x] if the answer is "yes". You can first publish the PR and check them afterward, for convenience.)

• Completely new example
• Updated an existing example to newer Flink version or dependencies versions
• Improved an existing example
• Modified the runtime configuration of an existing example (i.e. added/removed/modified any runtime properties)
• Modified the expected input or output of an existing example (e.g. modified the source or sink, modified the record schema)