[list] argument parsing does not work as expected

[nanjiangshu]

Describe the bug
Argument parsing for the list command does not work as expected.

For example:
To list files in a dataset with the following command is failed with the error Invalid base URL

./sda-cli-v0.3.0 --config s3cmd-bp-download.conf list  --dataset aa-Dataset-dy2tsg-9hvt2a --url https://download.bp.nbis.se 

However, the command works if you switch the flag for --dataset and --url

./sda-cli-v0.3.0 --config s3cmd-bp-download.conf list   --url https://download.bp.nbis.se  --dataset aa-Dataset-dy2tsg-9hvt2a

Moreover, one get and 404 error for

./sda-cli-v0.3.0 --config s3cmd-bp-download.conf list  --url https://download.bp.nbis.se  --dataset aa-Dataset-dy2tsg-9hvt2a   --bytes

Steps to reproduce

Expected behavior

• Tests verifying the fix are added
• Readme is up to date with the latest release

Additional context

Version of sda-cli: v0.3.0

Estimation of size: small/medium/big

Estimation of priority: low/medium/high