Support adding custom fingerprint database files when use tech-detect flag

[nbxiglk0]

Hi，Team

When using the fingerprint recognition feature, the fingerprint database comes from the built-in https://github.com/projectdiscovery/wappalyzergo, sometimes I need to add some of my own app fingerprints to be recognized when scanning.

Please describe your feature request:

Accepts a user-specified fingerprint data file. The file format is consistent with https://github.com/projectdiscovery/wappalyzergo/blob/main/fingerprints_data.json. When the user specifies a custom fingerprint data file, the fingerprint recognition rule will use the user-specified file instead of the built-in default rule.
This file can be specified in config.yaml or on the command line.like httpx -l urls.txt -tech-detect -custom-finger finger.json。

[GeorginaReeder]

Thanks so much for your feature request @nbxiglk0 - we'll take a look into this! :)