Add page similarity comparison function

[a3vilc0de]

Discussed in https://github.com/projectdiscovery/httpx/discussions/1250

^{Originally posted by a3vilc0de June 26, 2023} Add page similarity comparison function to improve the accuracy of path scanning and reduce false positives，and -fs, -filter-string String filter responses with specified strings, add support for importing string files, in order to support a large number of target scans, need to filter multiple strings. Thanks

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