feat: add display legend
Closes MIN-169
Objective:
Implement legend bottom drawer with list of images
What has been done:
- implementation of legend bottom drawer with list of images
- unit tests
- legend's redux slice with possibility to include plugin-based legends in the future
Additional info:
- I've changed some types in the reaction layer's hooks as there were some weird problems with them. They probably come from breaking changes in openlayers types definitions
Edited by Adrian Orłów