[ACTION] Simplify Notion upload image affordance

It seems like the add block action is limited in its scope and only supports adding a small subsection of content. Ex. it only supports adding external image urls.

https://github.com/PipedreamHQ/pipedream/blob/master/components/notion/actions/append-block/append-block.mjs

https://www.notion.com/help/images-files-and-media#media-block-types
https://developers.notion.com/reference/patch-block-children

We need this append-block action to support uploading base64 encoded data urls. i.e. Append block children with `type: "file"`

In the meantime, we can work around this with this series of actions:
- create file upload (with the encoded data uri to upload)
- send file upload
- append block to parent (with a fake image url to get a block id, since this block doesn't let us specify any payload)
- update child block (with `{"type": "image","image": {"caption": [],"file_upload": {"id": "{{ @sendFile.id }}"}}}`

**Is there a specific app this action is for?**
Notion

**Please provide a link to the relevant API docs for the specific service / operation.**
https://developers.notion.com/reference/patch-block-children