The Bluetooth proxy feature includes proxy client
and proxy server. In addition to the proxy pdu
message used above, pb-gatt also uses the same
proxy pdu message.
Currently zephyr bluetooth mesh couples them in one file.
A file at the separation is called gatt_services.c,
which is used to contain Mesh Provisioning Service
and Mesh Proxy Service.
Another file in the separation is called proxy_msg.c,
which is used to process Proxy pdu messages.
Also according to Trond's suggestion:
Rename `CONFIG_BT_MESH_PROXY` to `CONFIG_BT_MESH_GATT`.
Create an additional promptless entry
`CONFIG_BT_MESH_GATT_SERVER` that selects
`CONFIG_BT_MESH_GATT` and is selected by
`CONFIG_BT_MESH_GATT_PROXY` or `CONFIG_BT_MESH_PB_GATT`.
Create additional `CONFIG_BT_MESH_PROXY` used to represent
proxy feature (also include proxy client).
see #36343
Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
3a559e972a