Support JavaEE DataSources in JdbcWriter

[pmwmedia]

Data sources are an alternative way to declare JDBC database connection for Java EE. On the most web servers, the classic way of creating database connections via DriverManager.getConnection() works as well as via data sources. But tomcat, for example, doesn't support loading JDBC drivers as services out of the box. A clearcut solution would be to support data sources in JdbcWriter.

Data sources in Tomcat: https://wiki.apache.org/tomcat/UsingDataSources
Standard way: http://stackoverflow.com/questions/2279913/is-there-a-standard-way-to-define-a-jdbc-datasource-for-java-ee-containers#16261491

[pmwmedia]

Done in commit 7fa8c1e

[github-actions]

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