Allow CSV file uploads and update the CSV with latest user scrobbles

[davidomarf]

Description

This adds a working workflow for the CSV File upload functionality.
After uploading the CSV, it'll:

• read the filename, and guess the username,
• create the scrobbles list

Then it'll compare the user playcount, and the scrobbles list size. If they don't match, it'll calculate the number of pages left to complete the list and update it in the app. Allowing the user to re-download an up-to-date CSV.

Motivation and Context

Prevent stressing the last.fm API.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Code maintainance (non-breaking change that makes existing code better)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have updated the changelog accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Name	Status	Preview	Updated
lastats-fm	✅ Ready (Inspect)	Visit Preview	Aug 22, 2022 at 2:21AM (UTC)