added one unique prometheus which tracks all microservices and added grafana custom dashboard for visually tracking of microservices

added common dependencies to root pom and actuator and prometheus dependency

See merge request !64

Device and company controller tests

See merge request !63

# Conflicts:
#   core/src/test/java/cz/muni/fi/pa165/core/company/CompanyRepositoryTest.java
#   core/src/test/java/cz/muni/fi/pa165/core/device/DeviceRepositoryTest.java
#   core/src/test/java/cz/muni/fi/pa165/core/house/HouseRepositoryTest.java
#   core/src/test/java/cz/muni/fi/pa165/core/metrics/MetricsRepositoryTest.java
#   core/src/test/java/cz/muni/fi/pa165/core/smartmeter/SmartMeterRepositoryTest.java
#   core/src/test/java/cz/muni/fi/pa165/core/user/UserRepositoryTest.java

Update Repository tests

See merge request !57

Deleting entities v5

See merge request !61

Metrics User update

See merge request !56

Update smart meter

See merge request !54

# Conflicts:
#   core/src/main/java/cz/muni/fi/pa165/core/user/UserController.java

Change of findAll methods in controllers

See merge request !55

Updated companyId in electricityPrice

See merge request !53

changed App class names

See merge request !52

renamed repository test classes and other minor tweaks

See merge request !51

Replaced LocalDateTime with Instance

See merge request !50