Add "Download/Connect via Python Client" Modal to Dataset View

[jstriebel]

Detailed Description

To make the Python client and functionality more discoverable, it would be great to have the download code next to the normal download functionality in the dataset view (see #5672). The specific code to download the current dataset (or a subpart) could be shown as a text-block with a copy-button next to it. The content could be something like:

pip install webknossos

import webknossos as wk

with wk.webknossos_context(token="MY_TOKEN"):
    dataset = wk.Dataset.download(
        dataset_name_or_url="dataset_name",
        organization_id="my_organization",
    )

With links to the generic documentation and the exact download methods:
https://docs.webknossos.org/api/webknossos/dataset/dataset.html#Dataset.download
https://docs.webknossos.org/webknossos-py

We might want to adapt the code, depending on if it's a public dataset (no token necessary) or if it uses a sharing token. We might also add UI to specify a subset (bbox, layers, mags).