`:e` command opens new file instead of open dialog

Describe the bug
I want to open an existing file and use vscode's open dialog. Looking at the code, it should be possible with :e without arguments, but currently :e opens a new untitled file.

To Reproduce
Execute :e command in normal mode.

Expected behavior
VSCode's open dialog is shown (same as File -> Open File...)

Environment (please complete the following information):

• Extension (VsCodeVim) version: v1.24.1
• VSCode version: 1.72.2
• OS: Win10

Additional context
This behavior seems to be already implemented:
https://github.com/VSCodeVim/Vim/blob/5f312cb5ef86eb4c8ffd6840b3442f471eeba3a9/src/cmd_line/commands/file.ts#L172
but the code is currently unreachable because omitting the file argument to the command results in args.file being undefined. This also means that args is identical for :e and :enew commands, and currently the :enew behavior is executed first.

I would propose to set the default for the fileNameParser to '' to fix this here:
https://github.com/VSCodeVim/Vim/blob/5f312cb5ef86eb4c8ffd6840b3442f471eeba3a9/src/cmd_line/commands/file.ts#L87

If you agree, I could create a PR for this.

Trying :e . to open the current folder results in an error that I am opening a directory, where a sensible behavior would be to show the file open dialog at the specified folder, but maybe that is a different feature request.

Start in src/cmd_line/commands/file.ts, especially the fileNameParser and command handling around the cited lines. Reproduce :e and :enew in VSCode, then verify the argument parsing and dispatch behavior. Done means :e opens the VSCode file dialog while :enew still opens a new untitled file.