OZG-6514 Anbindung Collaboration Manager

api/gateway-config.yml

api/proto/clientattribute.model.proto

api/proto/collaboration.model.proto

api/proto/collaboration.proto

api/proto/common.model.proto

api/proto/fachstelleregistration.model.proto

api/proto/fachstelleregistration.proto

api/proto/vorgang.model.proto

internal/config/config.go

internal/config/config_test.go

internal/config/testdata/test_config.yml

internal/logging/testdata/test_config.yml

internal/mock/grpc_server.go

internal/mock/grpc_server_test.go

internal/mock/testdata/test_config.yml

internal/server/handler.go

internal/server/handler_test.go

internal/server/http_gateway.go

internal/server/http_gateway_test.go

internal/server/middleware.go