Terry Collins paced anxiously on one of the fields at the back of the Tradition Field complex Monday morning. A group of seven infielders stood around laughing and joking, waiting to start their first drills of the season. Collins looked around impatiently when a murmur of recognition rolled through the crowd of fans lining the fences. David Wright ran through the crowd and onto the field and straight out to third base ready to work. “There he is,” the Mets’ manager said loudly. “Let’s go.” After Wright signed a new eight-year, $138 million deal this offseason, Wright and Collins recognize that the third baseman has an even bigger leadership role to play this season on this young Mets team. That role could be made official soon. Collins said he would like to start the process of making Wright the fourth team captain in Mets history — putting him alongside Keith Hernandez, Gary Carter and John Franco.