[VelaBT Gdb] Added script to show all BT commands help usage info.

bug: V/46055

Example:
(gdb) bthelp

========================================
Help for command: btsocket
========================================
usage: [-h] [-s] [-c] [-d] [-t {scan}]

Command to traverse socket lists and print IPC server/client msg_queue lengths.

options:
  -h, --help            show this help message and exit
  -s, --server          Traverse g_instances_list for server.
  -c, --client          Traverse g_bt_ins for client.
  -d, --detail          Show detailed packet information.
  -t {scan}, --type {scan}
                        Specify the packet type to process (e.g., 'scan', 'gatt', 'state').

========================================
Help for command: btdev
========================================
usage: [-h] -t {le,br}

Command to traverse device lists and print detailed device information.

options: -h, --help            show this help message and exit
  -t {le,br}, --type {le,br}
                        Specify the device type to traverse (e.g., 'le' for BLE, 'br' for BR/EDR).
Signed-off-by: zhongzhijie1 <[email protected]>

tools/gdb/btdiag_init.py

@@ -62,3 +62,32 @@
             gdb.write(f"Failed to source module {module_path}: {e}\n")
     else:
         gdb.write(f"Module not found: {module_path}\n")
+
+
+# Register the bthelp command in GDB
+class BtHelpCommand(gdb.Command):
+    """Custom command to show help information for Bluetooth-related GDB commands."""
+
+    def __init__(self):
+        super(BtHelpCommand, self).__init__("bthelp", gdb.COMMAND_SUPPORT)
+
+    def invoke(self, arg, from_tty):
+        # Iterate through the modules and execute the help command for each
+        for module_name in modules_to_register:
+            command_name = module_name.split(".")[
+                -1
+            ]  # Extract the command name from module name
+            try:
+                # Print a divider for each command
+                gdb.write(f"\n{'=' * 40}\n")
+                gdb.write(f"Help for command: {command_name}\n")
+                gdb.write(f"{'=' * 40}\n")
+
+                # Execute the help command for each registered module
+                gdb.execute(f"{command_name} -h")
+            except gdb.error as e:
+                gdb.write(f"Failed to execute help for {command_name}: {e}\n")
+
+
+# Instantiate the bthelp command
+BtHelpCommand()