app/teams: add getMember method (#19862)

app/teams/teams.go

@@ -196,3 +196,13 @@ func (ts *TeamService) RemoveTeamMember(teamMember *model.TeamMember) error {
 
 	return nil
 }
+
+// GetMember return the team member from the team.
+func (ts *TeamService) GetMember(teamID string, userID string) (*model.TeamMember, error) {
+	member, err := ts.store.GetMember(context.Background(), teamID, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	return member, err
+}