data access documentation

[sh-rp]

Description

Direct access to the changed section: https://deploy-preview-2006--dlt-hub-docs.netlify.app/docs/devel/general-usage/dataset-access/

This PR adds the docs for our dataset features. This updated section will replace the "exploring-the-data" section currently in the docs. The exploring-the-data pages is now split across three new pages:

• general-usage/dataset-access/streamlit - which I also updated to remove errors and add some clarifications. Links in existing docs are also updated
• general-usage/dataset-access/sql-client - which explains how our sql client works, how you can use it if you for some reason need to and also has a section with some internals about how it works on filesystem which I have linked to from other places so users understand what is going on
• general-usage/dataset-access/data-quality-dashboard - this I just copied over unmodified. I'm not sure that this page is in the right place now. I also think it is very general and could need some more concrete content, but that is out of scope for this PR. We may choose to move it though, @AstrakhantsevaAA what do you think?

Then there are two new pages:

• general-usage/dataset-access/dataset - How to access data with our datasets with many examples, I quite like the structure
• general-usage/dataset-access/ibis-backend - How to get a native ibis backend from a dataset.

TODO:

• replace all references to._datasetwith .dataset once renamed on devel.
• If we manage to put ibis expression support for datasets into the next release, we need to add usage info for this too
• If we add schema_name to the dataset factory function on the pipeline, document this too.

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[AstrakhantsevaAA]

Very good docs! Easy to read and understand 👍
left a bunch of small changes, apply them or not, up to you