feat: add the optional contact parameter for pjsua

[emrahcom]

This commit adds an optional --contact parameter for pjsua client.

When video-sip-gateway client is behind a NAT, it may be needed to set --contact to inform invitee for the accessible endpoint which is not always the same with inviter's SIP address.

This commit allows to set contact through jitsi-component-selector API.

A sample request may be like the following

{
  "callParams": {
    "callUrlInfo": {
      "baseUrl": "$JITSI_HOST",
      "callName": "$JITSI_ROOM"
    }
  },
  "componentParams": {
    "type": "SIP-JIBRI",
    "region": "default-region",
    "environment": "default-env"
  },
  "metadata": {
    "sipClientParams": {
      "userName": "$INVITER_USERNAME",
      "password": "$INVITER_PASSWORD",
      "contact": "$INVITER_CONTACT",
      "sipAddress": "$INVITEE",
      "displayName": "Caller",
      "autoAnswer": true
    }
  },
  "callLoginParams": {
    "domain": "sip.jitsi.mydomain.com",
    "username": "sip",
    "password": "$PROSODY_SIP_PASSWD"
  }
}

[jitsi-jenkins]

Hi, thanks for your contribution! If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[codecov[bot]]

Codecov Report

Merging #504 (ba71c1c) into master (9b9afdd) will decrease coverage by 0.03%. The diff coverage is 50.00%.

Additional details and impacted files

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