Start: Switch to python script

Direct python can be used for requirements checking. Remove the ps1
script and create a venv purely in batch.

Signed-off-by: kingbri <bdashore3@proton.me>

start.py

@@ -0,0 +1,58 @@
+"""Utility to automatically upgrade and start the API"""
+import argparse
+import os
+import pathlib
+import subprocess
+from main import entrypoint
+
+
+def get_requirements_file():
+    """Fetches the appropriate requirements file depending on the GPU"""
+    requirements_name = "requirements-nowheel"
+    ROCM_PATH = os.environ.get("ROCM_PATH")
+    CUDA_PATH = os.environ.get("CUDA_PATH")
+
+    # TODO: Check if the user has an AMD gpu on windows
+    if ROCM_PATH:
+        requirements_name = "requirements-amd"
+    elif CUDA_PATH:
+        cuda_version = pathlib.Path(CUDA_PATH).name
+        if "12" in cuda_version:
+            requirements_name = "requirements"
+        elif "11" in cuda_version:
+            requirements_name = "requirements-cu118"
+
+    return requirements_name
+
+
+def get_argparser():
+    """Fetches the argparser for this script"""
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-iu",
+        "--ignore-upgrade",
+        action="store_true",
+        help="Ignore requirements upgrade",
+    )
+    parser.add_argument(
+        "-nw",
+        "--nowheel",
+        action="store_true",
+        help="Don't upgrade wheel dependencies (exllamav2, torch)",
+    )
+    return parser
+
+
+if __name__ == "__main__":
+    parser = get_argparser()
+    args = parser.parse_args()
+
+    if args.ignore_upgrade:
+        print("Ignoring pip dependency upgrade due to user request.")
+    else:
+        requirements_file = (
+            "requirements-nowheel" if args.nowheel else get_requirements_file()
+        )
+        subprocess.run(f"pip install -U -r {requirements_file}.txt")
+
+    entrypoint()