Test: share provider proposed API

[joyceerhl]

Refs: #176316

• anyOS @ulugbekna
• anyOS @aiday-mar
• anyOS @Yoyokrazy

Complexity: 5
Roles: Developer, Engineering Manager

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Background

We're exploring a share provider API to support sharing actions built into core. This API is not for finalization this milestone.

Currently this is integrated primarily through:

1. the new Share... command in the command palette
2. a Share... button that is positioned next to the command center when "window.commandCenter": true and "workbench.experimental.share.enabled": true (the latter setting is currently not advertised in settings UI)

Eventually we will also leverage this API for surfacing Share in other areas such as context menus in the editor and tree views.

Testing

Please try out this provider API in an extension:

https://github.com/microsoft/vscode/blob/main/src/vscode-dts/vscode.proposed.shareProvider.d.ts

Please verify that:

• Your specified sort order is respected WRT other available options
• The document selector is respected when deciding whether to show a provider as an option for a resource URI
• The current API and docstrings make sense

Known issues:

• There is no onShare event yet because all extensions which want to adopt it are already onStartupFinished or onFileSystem activated
• Do not test the TreeItem.shareableItem part of the proposal; that isn't being used in core yet