Take maxDepth value from user to specify maximum crawl depth

[Aman-Codes]

Description

Currently maximum crawl depth is hardcoded as 1. Instead the user should specify the value as a parameter in post request which will override the default value.

Relevant Files

• https://github.com/webevaluator/goBackend/blob/master/pkg/router/router.go
• https://github.com/webevaluator/goBackend/blob/master/pkg/invoke/invoke.go
• https://github.com/webevaluator/goBackend/blob/master/pkg/core/crawler.go