Add TLS Support

[willhoney7]

Adds support for passing in tlsOptions to a faktory connection: faktory.connect({ tlsOptions: { ... } });

A few notes:

• I didn't add any tests, couldn't get the test suite to run locally (before my changes). Docker would boot up fine, but I kept getting timeout errors in ~1/2 the tests.
• "host" and "port" are available as tlsOptions that technically override the passed in host and port values. Probably not a big deal, just something to be aware of.
• My initial approach was to just "upgrade" the socket to a TLSSocket in the constructor but that didn't work correctly. Instead I had to modify the "connect" method to create a "new" TLSSocket, re-setup listeners, etc., when in tls mode.

  constructor(
    port: string | number,
    host?: string,
    tlsOptions?: tlsConnectionOptions
  ) {
    ...
    this.socket = new Socket();
    // this approach didn't seem to work.
    if (this.tlsOptions !== undefined) {
        this.socket = new TLSSocket(this.socket, tlsOptions);
    }
    this.socket.setKeepAlive(true);
    ...
  }

Closes #405

[jbielick]

Thank you.

[jbielick]

released in 4.6.0

npm notice name: faktory-worker
npm notice version: 4.6.0
npm notice filename: faktory-worker-4.6.0.tgz
npm notice package size: 34.9 kB
npm notice unpacked size: 119.7 kB
npm notice shasum: d8940f4f72468322120af453586cda81edf472a2
npm notice integrity: sha512-uof2Ym3IysNWa[...]hlXBGzxjup4sA==
npm notice total files: 35