Adds a backup method (#88948)
Adds a backup method to the custom editor API proposal. This method allows custom editors to hook in to VS Code's hot exit behavior If `backup` is not implemented, VS Code will assume that the custom editor cannot be hot exited. When `backup` is implemented, VS Code will invoke the method after every edit (this is debounced). At this point, this extension should back up the current resource. The result is a promise indicating if the backup was successful or not VS Code will only hot exit if all backups were successful.
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