Add configurable request body size limiting middleware

[Jeet-Srivastava]

Is your feature request related to a problem? Please describe.
Currently, GoFr does not provide a built-in way to limit the size of incoming HTTP request bodies. This can lead to:

• Potential DoS attacks by sending very large payloads
• Excessive memory and CPU usage under heavy or malicious traffic
• Unexpected performance degradation if clients accidentally send large bodies

I’d like a framework-level solution so that every service does not have to implement this logic manually.

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Describe the solution you'd like
I would like GoFr to provide a configurable request body size limiting middleware, for example BodySizeLimit, with the following behavior:

• Enforce a maximum allowed request body size (default: 10 MB)
• Allow configuration via an environment variable, e.g. HTTP_MAX_BODY_SIZE
• For requests exceeding the configured limit:
  • Return HTTP 413 Payload Too Large
  • Do not invoke the next handler in the chain
• Use existing GoFr middleware patterns (same function signatures / registration style)
• Optionally skip enforcing limits for methods that typically don’t have bodies (e.g. GET, HEAD, DELETE)

This middleware can be registered globally in the app, for example:

maxBodySize := config.GetInt64("HTTP_MAX_BODY_SIZE")
app.Use(middleware.BodySizeLimit(maxBodySize))

[Jeet-Srivastava]

I have raised a Pr against this issue please look at the pr request #2598