feat: extract opengait_studio monorepo module

Move demo implementation into opengait_studio, retire Sports2D runtime integration, and align packaging with root-level monorepo dependency management.

opengait/evaluation/evaluator.py

@@ -1,7 +1,7 @@
 import os
 from time import strftime, localtime
 import numpy as np
-from utils import get_msg_mgr, mkdir
+from opengait.utils import get_msg_mgr, mkdir
 
 from .metric import mean_iou, cuda_dist, compute_ACC_mAP, evaluate_rank, evaluate_many
 from .re_rank import re_ranking

opengait/evaluation/metric.py

@@ -2,7 +2,7 @@ import torch
 import numpy as np
 import torch.nn.functional as F
 
-from utils import is_tensor
+from opengait.utils import is_tensor
 
 
 def cuda_dist(x, y, metric='euc'):