response_cache: automatically connect the cache storage when available

[bnjjj]

This PR adds support for automatic reconnection when we start the router without the pg database available and we set required_to_start: false in configuration. It will start properly and will automatically connect to the database once it's available.

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* (developer-tools)/kotlin/v5/index.mdx
* (developer-tools)/kotlin/v5/advanced/compiler-plugins.mdx

Build ID: 70531c8fbc49b72c2cea2e3f

URL: https://www.apollographql.com/docs/deploy-preview/70531c8fbc49b72c2cea2e3f

[github-actions]

@bnjjj, please consider creating a changeset entry in /.changesets/. These instructions describe the process and tooling.