Use default values from default bundle configuration instead of hardcoded constants

Problem/Motivation

This task is a follow-up to this comment → .
Basically, we should review and replace (where possible) usages of constants with default configuration object, that will be used for default values for new bundles.

Proposed resolution

Get default values for bundle/entities in the following order:
1) Default configuration object;
2) Current default values set in constants if the configuration is empty (it can be removed manually);