docs: rewrite the data model and schema design docs

[evenyag]

What's Changed in this PR

This PR rewrites the data model and schema design docs.

The new design guide covers

• Column types and selection
• Primary key and index selection
• Deduplication
• Distributed tables

It also modifies the data model document to correct some concepts.

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[killme2008]

Great work! However, I think we should include some practical guidelines, particularly a series of 'how-to' guides. For instance, we could cover topics such as:

• Best practices for designing a traces table
• Guidelines for structuring a log table
• How to desgin table for prometheus-like metrics
• Guidelines for Iot Devices sensors
• And similar common use cases

[killme2008]

Let's go! It's a great step!