Added database info retrieval from user service

Most of this code was taken straight from the schema service. No tests
were written because this is entirely dependent on external
dependencies.

internal/usecases/databaseinfo/databaseinfo.go

+package databaseinfo
+
+import "query-service/internal/drivers/rpcdriver"
+
+// Service implements the databaseinfo usecases
+type Service struct {
+	rpcDriver rpcdriver.DriverInterface
+}
+
+// NewService creates a new databaseinfo service
+func NewService(rpcDriver rpcdriver.DriverInterface) *Service {
+	return &Service{
+		rpcDriver: rpcDriver,
+	}
+}

internal/usecases/databaseinfo/interface.go

+package databaseinfo
+
+import "query-service/internal/entity"
+
+// UseCase describes the databaseinfo usecase
+type UseCase interface {
+	GetDatabaseInfo(clientID *string, databaseName *string) (*entity.DatabaseInfo, error)
+}

internal/usecases/databaseinfo/mock/mockdatabaseinfo.go

+package mockdatabaseinfo
+
+import "query-service/internal/entity"
+
+// Service implements the databaseinfo usecase (mock)
+type Service struct {
+}
+
+// NewService creates a new databaseinfo service (mock)
+func NewService() *Service {
+	return &Service{}
+}
+
+// GetDatabaseInfo gets the database info for the clientID and database name provided
+func (s *Service) GetDatabaseInfo(clientID *string, databaseName *string) (*entity.DatabaseInfo, error) {
+	dbInfo := entity.DatabaseInfo{
+		URL:                  "test-url",
+		Username:             "test-user",
+		Password:             "test-password",
+		Port:                 1234,
+		InternalDatabaseName: "internal-test",
+	}
+	return &dbInfo, nil
+}

internal/usecases/request/mock/mockrequest.go

@@ -18,7 +18,7 @@ func NewService() *Service {
 }
 
 // SendAQLQuery sends the query to arangoDB and parses the result (mock)
-func (s *Service) SendAQLQuery(query string) (*map[string][]entity.Document, error) {
+func (s *Service) SendAQLQuery(query string, username string, password string, hostname string, port int, database string) (*map[string][]entity.Document, error) {
 	mockResult := make(map[string][]entity.Document)
 
 	if !s.throwError {