add new field 'port' in network protocol

[tarunKoyalwar]

Proposed Changes

currently in network template to allow running template against a different port than one hardcoded in template (ref: https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2001/CVE-2001-1473.yaml)
and this is achieved by sending 2 requests

tcp:
  - host:
      - "{{Hostname}}"
      - "{{Host}}:22"

and this will always cause 1 requests to fail . currently there are more than 100 network templates so 100 requests will fail

in this PR we introduce port: 2345 <- port field in network template and this is considered as default/hardcoded port and it addresses mainly three cases

• if port is not specified in input then default port i.e 2345 is used
• if input is something like 'scanme.sh:443 or scanme.sh:8081' we use default port '2345' since network requests are usually (mostly) requested aganist non-http services

below contains port that are ignored
// reservedPorts contains list of reserved ports for non-network requests in nuclei
reservedPorts = []string{"80", "443", "8080", "8443", "8081", "53"}

• if input port contains any non standard port like scanme.sh:3674 (i.e non http) then 3674 is used instead of hardcoded 2345

[tarunKoyalwar]

$ TESTS="network/network-port.yaml" ./run.sh
::group::Build nuclei
::endgroup::
::group::Build nuclei integration-test
::endgroup::
::group::Installing nuclei templates

                     __     _
   ____  __  _______/ /__  (_)
  / __ \/ / / / ___/ / _ \/ /
 / / / / /_/ / /__/ /  __/ /
/_/ /_/\__,_/\___/_/\___/_/   v2.9.13

		projectdiscovery.io

[INF] No new updates found for nuclei templates
::endgroup::
skipping test case http/interactsh.yaml. disabled on darwin.
skipping test case http/interactsh-stop-at-first-match.yaml. disabled on darwin.
skipping test case http/default-matcher-condition.yaml. disabled on darwin.
[✓] Test "network/network-port.yaml" passed!

[tarunKoyalwar]

Example template

id: network-port-example

info:
  name: Example Template with Network Port
  author: pdteam
  severity: high
  description: This is an updated description for the network port example.
  reference: https://updated-reference-link

tcp:
  - host: 
      - "{{Hostname}}"
    port: 23846
    inputs:
      - data: "PING\r\n"
    read-size: 4
    matchers:
    - type: word
      part: data
      words:
        - "PONG"

[Mzack9999]

Implementation: lgtm
Notes:

• Near impossible to write network templates towards http/https ports when different reserved port is defined (eg ssh with reserved port 22 but user input with custom port 80)
• Would work very well with https://github.com/projectdiscovery/netdb for filtering ports:

exclude-ports: http,ftp

[tarunKoyalwar]

New Changes

• added exclude-ports option to overwrite default excluded ports
• added documentation regarding 'port' and why it should be used / preferred