Standardize inverted boolean flags

[natesales]

As of v0.16.0, we have some inverted flags, which make for confusing no-ops like q +nono-idcheck.

~ ▴ q -h | grep no
All long form (--) flags can be toggled with the dig-standard +[no]flag notation.
      --no-id-check            Disable checking of DNS response ID
      --no-reuse-conn          Use a new connection for each query
  -i, --tls-no-verify          Disable TLS certificate verification
      --quic-no-pmtud          Disable QUIC PMTU discovery
      --quic-no-length-prefix  Don't add RFC 9250 compliant length prefix

• [x] Invert flags
• [x] Allow setting flags to false

[natesales]

The only one I want to leave is -i/TLS insecure skip verify since that's a common enough convention.