Add module for SNMP

[DanielRaapDev]

Is your feature request related to a problem? Please describe.
Make it possible to configure the SNMP daemon via Ansible. So monitoring of the pfSense is possible.

Describe the solution you'd like
A new module pfsense_snmp that configures the SNMP daemon. It should offer all the options the Web UI also provides.

- name: Configure SNMP Server
  pfsensible.core.pfsense_snmp:
    state: present
    # SNMP Daemon
    enable: true
    # SNMP Daemon Settings
    pollport: 161
    rocommunity: public
    syscontact: admin@example.com
    syslocation: somewhere
    # SNMP Traps Enable
    trapenable: true
    trapserver: 1.2.3.4
    trapserverport: 162
    trapstring: exampletrap
    # SNMP Modules
    modules:
      - mibii
      - netgraph
      - pf
      - hostres
      - ucd
      - regex
    # Interface Binding
    ipprotocol: inet46
    bindip:
      - lan

Describe alternatives you've considered
None.

Would be nice to have.

[opoplawski]

I'm afraid I have barely enough time to just work on the items I need myself. A PR would be welcome. We do have a new script that might help with writing a new module. Checkout the GENERATING_MODULES.md doc.