Ability to import bulk products(CSV file) directly from admin UI

[dlhck]

Migrated from #2496

Is your feature request related to a problem? Please describe.
The only way to import a product catalogue in a CSV file is by doing it programmatically. A good number of vendure users migrate other big platforms such as Shopify and Bigcommerce and it would be easier if there was a way to quickly import their catalogue from the Admin UI.

Describe the solution you'd like
A button where you can import a csv file on admin UI that can populate the products.

*Describe alternatives you've considered!
None

Additional context
I've capture similar implementation in Medusa in screenshots below.


Screen Shot 2023-10-30 at 12 57 00 PM

[m-i-l]

For multi-vendor marketplaces it would be helpful if sellers could manage their own bulk imports with functionality such as this. It would be especially useful in marketplaces where sellers manage a larger number of lower value items, i.e. where they don't want to spend too much time manually creating individual listings.