Group sample by type of Db2

[angoca]

Even all these samples are for Db2 (previously for LUW), not all example run in the current different flavors of Db2. For example, the current pull request "Added demo for external model deployment via Python UDF. Also reorganized files for easier navigation" is just for Db2 Warehouse, it does not run in other Db2, because external UDF written in python are not supported in all editions. With this in mind, I propose to put tags to indicate where each sample can be executed. Or something to group the sample by Db2 type.