docs: add docs on modules

[mpoke]

Description

Closes: #XXXX

ToDo:

• update previous pages to be consistent with the changes introduced by permissionless @insumity
• add state for consumer module in docs/docs/build/modules/03-consumer.md
• add info on client (CLI, REST, gRPC) for both consumer and provider module @sainoe

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Author Checklist

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I have...

• included the correct docs: prefix in the PR title
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• Checked that the documentation website can be built and deployed successfully (run make build-docs)