Completions with snippets aren't supported in Visual studio

[rchiodo]

Describe the bug [A clear and concise description of the bug]

Steps to Reproduce

1. Open https://github.com/microsoft/pylance-release/tree/main/testing/single
2. Open completions.py
3. Bring up the last completion for the BuiltinMethod

Expected behavior

class BuiltInMethod:
    def __init__(self) -> None:
        pass

Actual Behavior

class BuiltInMethod:
    def __init__(self) -> None:
    ${0:pass}