support tls fingerprint args in constructor

[landonsilla]

hey nate! first off big thanks for this package. it has been incredibly valuable for project.

I'm wanting to include the tls ciphers list (and other, similar params) on the agent constructor:

new HttpsProxyAgent('http://user:pass@$example.com:1234' {
  rejectUnauthorized: false,
  ciphers: [
    'ECDHE-ECDSA-AES128-GCM-SHA256',
    'ECDHE-RSA-AES128-GCM-SHA256',
    'ECDHE-ECDSA-AES256-GCM-SHA384',
    'ECDHE-RSA-AES256-GCM-SHA384',
    'DHE-RSA-AES128-GCM-SHA256',
    'DHE-RSA-AES256-GCM-SHA384'
    ].join(':'),
    honorCipherOrder: true,
    secureProtocol: 'TLSv1_2_method',
})

(Btw, i am making GETs to https://check.ja3.zone/ to check if the fingerprint is changing, e.g. the ciphers declaration is effective)

I found that the ciphers, honorCipherOrder, secureProtocol params don't make it to the base http.Agent object, which is needed to have the effect I'm looking for. And, including the constructor opts in the this.options seems to do the trick.

I'll be honest, I don't deeply understand this code. I just know that this code diff has the affect i desire. Perhaps there are keys that should/should not be here???? Perhaps you want a blacklist or whitelist strategy? I see you have the omit function to remove things. I don't have a strong preference on this stuff, I just want ciphers, honorCipherOrder, secureProtocol (and secureOptions) to be included in this.options.

Thanks again! I hope this is helpful.

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