[doc] add documention on @tsed/adapters

[Romakita]

Information

The @tsed/adapters is ready since a long time. But his documentation is missing.
His API allow to wrap any kind of databases and abtracts small actions for oidc-provider and other small plugin.

It could be interesting to open the api for any contributors.

Acceptance criteria

• a new section is available on the website

[stale]

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