Expose dialog title in extensions API

[sguillia]

The current openDialogOptions are:

canSelectFiles?: boolean
canSelectFolders?: boolean
canSelectMany?: boolean
defaultUri?: Uri
filters?:
openLabel?: string

Could we also have access to the dialog title?
I believe electron does expose it here.

[vscodebot]

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Happy Coding!

[sguillia]

lol if this gets 20 upvotes I'll pay you a beer

[GustavoASC]

@aeschli @alexr00
I believe it's easy to expose dialog title in public API. Can I help you making a pull request on this?

We need to:

1. Add an optional parameter named title on both OpenDialogOptions and SaveDialogOptions interfaces (which are currently located on vscode.d.ts)
2. Add the same optional parameter on MainThreadDialogOpenOptions and MainThreadDialogSaveOptions interfaces
3. Modify MainThreadDialogs methods, delegating this new parameter to IOpenDialogOptions.title and ISaveDialogOptions.title

According to this guide the API modifications should be done on vscode.proposed.d.ts for later discussions, right?

(This is the first time I try to contribute to a public VSCode API, so I'm still getting familiar with the overall process).

Thanks in advance!