feat(android): option to remove X-Titanium-Id in request header

[m1ga]

Currently the httpclient will always set a X-Titanium-Id. You can set it to be a different string or empty but you can't remove it.

This PR will add a propety titaniumId: false so you can disable it. If it is not set it will still be true so it doesn't change anything for users that rely on it.

var url = "httpbin.org/get";
var client = Ti.Network.createHTTPClient({
    onload : function(e) {
        Ti.API.info("Received text: " + this.responseText);
    },
    titaniumId: false, // <--------------- remove the field
    onerror : function(e) {},
    timeout : 5000
});

client.open("GET", url);
// client.setRequestHeader("X-Titanium-Id", null);  // doesn't work
// client.setRequestHeader("X-Titanium-Id", '');  // still there but empty
client.send();

output without the PR:

[INFO]  Received text: {
[INFO]   "args": {},
[INFO]   "headers": {
[INFO]     "Accept-Encoding": "identity",
[INFO]     "Host": "httpbin.org",
[INFO]     "User-Agent": "Titanium SDK/12.7.0 (Pixel 9 Pro; Android API Level: 35; de-DE;)",
[INFO]     "X-Amzn-Trace-Id": "Root=1----",
[INFO]     "X-Titanium-Id": "xxxx-xxxxx-xxxxx-xxxx"                <----- this will be gone
[INFO]   },
[INFO]   "origin": "...",
[INFO]   "url": "http://httpbin.org/get"
[INFO]  }

TODO:
Would be nice to have it here: https://github.com/tidev/titanium-sdk/blob/master/iphone/Classes/TiNetworkHTTPClientProxy.m#L53 for iOS too