Make properties for the application's version and PID available in the Environment

[philwebb]

For structured logging it would be useful if we could access application properties (such as spring.application.version, spring.application.pid) from the Environment. Adding them would also allow us to simplify ResourceBanner implementation.

[khairmuhammad]

Hi, Can I work on this?

[philwebb]

Thanks for the offer @khairmuhammad, but I think we need to do some design work to check how the overlap with ResourceBanner might work. I forgot to add the pending-design-work label (which I've now done).

[mhalbritter]

I've got something we should talk about in a team meeting.