[Feature] Add TCP support

[LorenzoTettamanti]

Is your feature request related to a problem?

• [ x] Yes

  Problem Description::

  Right now the Proxy only supports DNS-over-UDP. Some DNS clients and environments require TCP for DNS
  queries, especially for larger responses that exceed UDP limits. Supporting TCP would make Cortexflow Proxy more robust and versatile.

  Solution:

  I will add a TCP listener to handle asynchronous TCP connections.

Features:

• Caching
• Logging and monitoring
• Prometheus integration

---