New page for usage limits

[max-vostrikov]

Placeholder for future page where info on usage limits will be. There are no limits yet, but we are preparing to rollout them soon.

Summary

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx

[justindeguzman]

Thanks @max-vostrikov. Will convert this to draft for now so we know not to merge until ready

[gingerwizard]

@max-vostrikov under what version will we impose these limits?

[max-vostrikov]

@gingerwizard limits are not tied to a version. The settings to impose them already exist, we need only to enable them