vscode.terminal scheme for lsp REPL should conform to all OS

[anthonykim1]

We use virtual document with custom vscode terminal scheme. Meaning, we craft the path while creating unique URI for specific lsp REPL user is creating.

Currently we the path be specific to Mac, Linux since we don't have support for Windows in terms of Python lsp support for it (shell integration for Python isn't supported in Windows yet due to GNU readline restriction).

Once we make lsp REPL more generic to support more than Python, we should make sure to make the URI and its path is generic and conforming to user's OS