Feature: Integrate dash uploader

[rakrsh]

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Contributor Checklist

• I have broken down my PR scope into the following TODO tasks
  • task 1
  • task 2
• I have run the tests locally and they passed. (refer to testing section in contributing)
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[sonarqubecloud]

Quality Gate failed

Failed conditions
16 New Blocker Issues (required ≤ 5)

See analysis details on SonarQube Cloud

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[robertclaus]

@rakrsh thank you for looking into this! Adding an uploader component directly to Dash is an interesting idea. We took a quick look at the implementation in this PR and have some suggestions.

1. The dash-uploader code this is porting over hasn't been maintained in a while; so we would want to re-implement the functionality if we're introducing it as a new core component.
2. We're on the fence about whether a component this complex should be part of the Dash core repo vs a standalone package. I think we could be convinced either way, but a standalone package benefits from being easier to maintain.
3. There are some considerations for how this would integrate with Plotly's app hosting services on Plotly Cloud and Dash Enterprise; so if we do want to add it to the core libraries it might be easier for Plotly to develop given that additional context.

Since the PR has been sitting for a few weeks, we're also going to close it for now. Your branch should still be available, so feel free to re-open if you continue to work on this!