Create new middleware for query params validation

[emmanuelm41]

Context

On an REST http server, endpoints usually receive some optional/mandatory values as configuration which modifies the endpoint behavior in some way. For example, when an endpoint process a request, and retrieve the response data in pages, clients usually send the page they want as a query param. Likewise, if the pagination uses cursor instead of plain pages, the cursor is sent there.

The problem

Getting the value from context and validating it can be done easily. However, the validation process may be spread across multiple endpoints that check the same parameter.

New feature

It would be great to have a middleware that can be "instantiated" with some specific configuration about which parameters should be validated, and how to validate each one. Based on that, the instantiated middleware can be coupled to desired endpoints, so that the validation process is concentrated on only one place.

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