WIP feat: Changed resource config to allow custom values

[Lasica]

Description

For fixing error with labels for nvidia gpus/tpus being not propagated/transmitted to environments properly

Resolves #199

PR Checklist

• [x] Tests added
• [x] Changelog updated

[Lasica]

Not ready yet, to be added: unit tests for custom values, tests for generator handling custom labels, test with nvidia gpu setup in the wild