Rename service package to core #85

Job	Run time
Integration Tests / Prepare Tests	3s
Lint / Lint Code	19s
Unit Tests / Prepare Tests	1s
Build / Prepare Build	2s
Unit Tests / ubuntu-latest, go.mod	15s
Unit Tests / ubuntu-20.04, go.mod	26s
Unit Tests / windows-latest, go.mod	3m 39s
Unit Tests / macos-latest, go.mod	43s
Build / Build for linux/amd64	27s
Build / Build for linux/arm64	17s
Build / Build for linux/arm	20s
Build / Build for linux/386	21s
Build / Build for windows/amd64	27s
Build / Build for darwin/amd64	19s
Build / Build for darwin/arm64	23s
Integration Tests / ubuntu-latest, PostgreSQL 15	25s
Integration Tests / ubuntu-latest, PostgreSQL 14	29s
Integration Tests / ubuntu-latest, PostgreSQL 13	39s
Integration Tests / ubuntu-20.04, PostgreSQL 15	44s
Integration Tests / ubuntu-20.04, PostgreSQL 14	43s
Integration Tests / ubuntu-20.04, PostgreSQL 13	34s
Publish	0s
	11m 36s

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