Add an API to programmatically scroll the workspace

[BeksOmega]

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Problem

Sometimes you want to change how your users interact with scrolling the workspace. E.g. if you have a workspace that only supports vertical scrolling or only supports horizontal scrolling, you may want to add buttons that scroll instead of using the scrollbars.

Context: https://groups.google.com/g/blockly/c/klLbJ1aQqsA/m/lYjP5tyAAgAJ

Request

Add an API for programatically scrolling the workspace. I'm not sure what the units should be (absolute vs relative, percentage vs workspace units, etc).

Alternatives considered

No response

Additional context

We currently have a scroll method on the workspace, but it is marked as @internal: https://github.com/google/blockly/blob/b8ad7d307f9f2abffe5306818155907287cfa634/core/workspace_svg.ts#L2179

To Fix

1. Remove the @internal tag from the scroll method.

[maribethb]

Seems reasonable to make the scroll function public. We just need to remove the @internal tag from the documentation comment.

Could you please assign me this issue.

[maribethb]

Hi @carthick, I've assigned you the issue. You can find some information about how to contribute to Blockly here. Thanks for your interest!

[SophieNguyen113]

I would love to work on this issue