Set default maxChunkSize to 1000MB

[szaimen]

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Is your feature request related to a problem? Please describe.
The default chunk size of 100MB for the uploads is too less in the current time. Please consider to change it to 1000MB.

Describe the solution you'd like
By changing the default value of the max_chunk_size to 1000MB, I was able to tremendously improve the upload speed for big files using the sync client

Describe alternatives you've considered
Maybe change it to 10000MB but thats probably already too much.

Additional context
I talk about this value: https://docs.nextcloud.com/desktop/3.2/advancedusage.html?highlight=chunk#:~:text=maxchunksize