Docs for External Sessions Data store

[krmahadevan]

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Description

Adding documentation to explain how to use an external data store for storing sessions.

Motivation and Context

The documentation for this is right now not there, even though the implementation already exists.

Types of changes

• Change to the site (I have double-checked the Netlify deployment, and my changes look good)
• Code example added (and I also added the example to all translated languages)
• Improved translation
• Added new translation (and I also added a notice to each document missing translation)

Checklist

• I have read the contributing document.
• I have used hugo to render the site/docs locally and I am sure it works.

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[krmahadevan]

@diemol - Please let me know if there's anything that needs to be changed in this PR.

[krmahadevan]

@diemol - I have addressed all your review comments, amended the commit with the changes and also rebased off of trunk. Please help take a look when you get the time.

[diemol]

Thank you, @krmahadevan!