Collected metric code into a single file

Author: zyjux

src/sharpness/__init__.py

@@ -13,7 +13,7 @@
 A limited CLI interface is provided in the "benchmark.py" file.
 """
 __version__ = "0.1.0"
-from .metric_list import metric_f, single_metrics
+from .metrics import metric_f, single_metrics
 
 from .high_level_functions import (
     compute_all_metrics_globally,

src/sharpness/fourier.py

@@ -1,5 +1,5 @@
 import numpy as np
-from sharpness.metric_list import metric_f, single_metrics
+from .metrics import metric_f, single_metrics
 
 
 # Function to chunk image into tiles to create sharpness heatmap

src/sharpness/gradient.py

@@ -1,5 +1,5 @@
 import numpy as np
-from .metric_list import metric_f, single_metrics
+from .metrics import metric_f, single_metrics
 from .heatmap import Heatmap, heatmap_list