fix: paging breaks with + sign on phone number

[thinkingserious]

Fixes #569

Checklist

• I acknowledge that all my contributions will be made under the project's license

[thinkingserious]

This was how I reproduced #569:

git clone https://github.com/twilio/twilio-java.git
cd twilio-java
touch ReproduceTwilioBug.java

ReproduceTwilioBug.java:

import com.google.common.collect.Iterators;
import com.twilio.Twilio;
import com.twilio.base.ResourceSet;
import com.twilio.rest.api.v2010.account.Call;

public class ReproduceTwilioBug {

    static {
        String accountSid = System.getenv("TWILIO_ACCOUNT_SID");
        String authToken = System.getenv("TWILIO_AUTH_TOKEN");
        Twilio.init(accountSid, authToken);
    }

    public static void main(final String args[]) {
        String toPhoneNumber = System.getenv("TWILIO_TO_PHONE_NUMBER");
        final String to = toPhoneNumber;
        countCalls(to);
        countCalls(to.replace("+", ""));
    }

    static void countCalls(final String to) {
        ResourceSet<Call> calls = Call.reader().setTo(to).pageSize(5).limit(20).read();
        System.out.println("For " + to + " " + Iterators.size(calls.iterator()) + " calls.");
    }
}

mvn install -DskipTests
javac -classpath ./target/twilio-7.55.0-jar-with-dependencies.jar:. ReproduceTwilioBug.java && java -classpath ./target/twilio-7.55.0-jar-with-dependencies.jar:. ReproduceTwilioBug

Result:

For +1951XXXXXXX 5 calls.
For 1951XXXXXXX 6 calls.

After this fix, Result:

For +1951XXXXXXX 6 calls.
For 1951XXXXXXX 6 calls.

[childish-sambino]

Is there any overlap with #570?

[thinkingserious]

#570 seems related to not handling non-JSON return values when paging fails. To be sure, I'd like to reproduce that one as well.