partial auto completion when coding

Bug report template:

###
For now, auto-completion partially works with LSP server (e.g. vscode), I can only see a little bit of method in the completion menu.
But, if I execute in ipython, then I can get the fulllists of methods

### Steps to reproduce
1. coding with vscode
2. create instance for instrument class e.g. `rigol_dg4000 : RigolDG4000`
3. type `rigol_dg4000.` to trigger the completion menu

### Expected behaviour
list all possible methods

### Actual behaviour
only partial of methods show up

### System
It would be helpful to provide such information:

**operating system**

If you are using a released version of qcodes (recommended):
**qcodes version** : 0.45.0

Reproduce the completion behavior in VS Code with Qcodes 0.45.0 using a RigolDG4000 instance, then compare the LSP completion results with the full method list shown in IPython. Trace the LSP server's completion entry point and verify that the completion menu exposes all expected methods.

Written by the indexing model from the issue text.