Search processes by process ID

[jbiblio]

"As a BPMN maintainer, I'd like to be able to search processes by their ID."

I'd like to propsoe #704.

This would introduce a simple search box by BPMN process id. The PR contains a rather simple implementation:

• minimum 3 characters (to not return all processes by an empty search)
• "starts with" semantics (search for proce*)
• add an additional index on some column.

That index may cause issues when deploying this feature on a large data set, since it may block the database completely (seen on Postgres).

--> A warning on the release page would be good.