Adding support for query param based rate limit [graphql based servers]

### Prerequisites - [X] I have written a descriptive issue title - [X] I have searched existing issues to ensure the feature has not already been requested ### 🚀 Feature Proposal Most GraphQL requests are POST and every request has the same URL, only what changes is a query param value, commonly `operation`. Adding support for rating limiting based on query param instead of the route. I was not able to locate a proper example of such an example. If it is supported and I could not find out, I guess we can close the issue, if you can share one. ### Motivation I have been using `mercurius` with `fastify` for the GraphQL server, I want to rate limit some critical paths. `fastify-rate-limit` does pretty good job, if you want route-based rate limiting. I was looking to rate limit based on query param. The server gets `operation` as a query param with values such as `signIn` or `forgetPassword` and so on. ### Example May not be very useful example signature, but guess send the message across. ``` await app.register(rateLimit, { global: true, timeWindow: 60 * 1000, max: 1000, queryBasedRateLimit: { [{ operation: ['signIn', 'signUp'], rateLimite: { timeWindow: 6 * 1000....etc. } }], [{ operation: ['verifyEmail', 'resendValidationEmail'], rateLimite: { timeWindow: 1 * 1000....etc. } }], } } ) ```