[docs] - Add input_config_schema to the I/O manager documentation

[danielgafni]

Summary

Add an example of input_config_schema to the I/O manager docs. This is currently only referenced in the unconnected inputs documentation; surfacing it in the I/O docs could be helpful.

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What's the issue or suggestion?

The input_config_schema option doesn't get any attention at the IO Managers page.

https://docs.dagster.io/concepts/io-management/io-managers#providing-per-output-config-to-an-io-manager

Additional information

No response

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