Add full yolov8 compatible post-processing (#115)

This updates the local detection to yolov8-based models from the older yolov5 based models.

This includes significant additional post-processing of the raw yolov8 output, but also means that the smaller nano yolo model is available as well as all of the updated ALVINN thorax training data.

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

Reviewed-on: Georgi_Lab/ALVINN_f7#115

src/models/thorax-0.1.0-n640/metadata.yaml

@@ -0,0 +1,54 @@
+description: Ultralytics thorax-0.1.0-n model trained on /data/ALVINN/Thorax/Thorax
+  0.1.0/thorax.yaml
+author: Ultralytics
+license: AGPL-3.0 https://ultralytics.com/license
+date: '2024-02-29T21:26:09.903031'
+version: 8.1.19
+stride: 32
+task: detect
+batch: 1
+imgsz:
+- 640
+- 640
+names:
+  0: Abdominal diaphragm
+  1: Aorta
+  2: Azygous vein
+  3: Brachiocephalic trunk
+  4: Caudal vena cava
+  5: Cranial vena cava
+  6: Esophagus
+  7: External abdominal oblique
+  8: Iliocostalis
+  9: Latissimus dorsi
+  10: Left atrium
+  11: Left auricle
+  12: Left lung
+  13: Left subclavian artery
+  14: Left ventricle
+  15: Longissimus
+  16: Pectoralis profundus
+  17: Pectoralis superficialis
+  18: Pericardium
+  19: Phrenic nerve
+  20: Primary bronchus
+  21: Pulmonary artery
+  22: Pulmonary trunk
+  23: Pulmonary vein
+  24: Rectus abdominis
+  25: Rectus thoracis
+  26: Recurrent laryngeal nerve
+  27: Rhomboideus
+  28: Right atrium
+  29: Right auricle
+  30: Right lung
+  31: Right ventricle
+  32: Scalenus
+  33: Serratus dorsalis caudalis
+  34: Serratus dorsalis cranialis
+  35: Serratus ventralis
+  36: Spinalis
+  37: Sympathetic chain
+  38: Trachea
+  39: Trapezius
+  40: Vagus nerve