build: add subcommands to kexttool

tools/kexttool/select.py

@@ -0,0 +1,19 @@
+import inquirer
+import os
+from kexttool import kext
+
+
+def select_kexts():
+    all_kexts = [ k.id() for k in kext.KextSource.scan(os.path.join(os.getcwd(), 'extensions')) ]
+    if len(all_kexts) == 0:
+        print('No kernel extensions available.')
+        return
+    
+    questions = [
+    inquirer.Checkbox('kexts',
+                    message="Select kexts to include in the kernel image",
+                      choices=all_kexts,
+                )
+        ]
+    answers = inquirer.prompt(questions)
+    print(answers["kexts"])