"Introduce custom "GrowBrosException" (abstract class?)"

Closes #33

See merge request !17

finished Search Endpoint

See merge request !19

added more Tests for Search Endpoint, focus on testing different searchRequest combinations, finished tests for Search Endpoint #23

Resolve: "fix: import issues for user repository after refactoring"

Closes #35

See merge request !18

# Conflicts:
#	requests.http
#	src/main/java/hdm/mi/growbros/controllers/PlantsController.java
#	src/main/java/hdm/mi/growbros/service/PlantsService.java

# Conflicts:
#	requests.http
#	src/main/java/hdm/mi/growbros/repositories/PlantRepository.java

Resolve "fix / refactor: move UserRepository into repositories package"

Closes #26

See merge request !16

#7 backend of wishList

See merge request !14

#29 Pagination for Plants endpoint w/ CustomPageDTO

See merge request !15

# Conflicts:
#	src/main/java/hdm/mi/growbros/exceptions/PlantNotFoundException.java