Node stops as soon as app goes to background

[ovitrif]

Currently the node stops as soon as the app goes into background. This could be improved by attaching the node lifecycle to a (foreground) service.

[jvsena42]

Example

https://github.com/jvsena42/floresta_node/blob/main/app/src/main/java/com/github/jvsena42/floresta_node/domain/floresta/FlorestaService.kt