feat: add the optional auto-answer-timer parameter for pjsua

[emrahcom]

This commit allows to set --auto-answer-timer of pjsua through jitsi-component-selector API. Normally auto-answer-timer has a hardcoded value which is 30 secs and this doesn't suit all use-cases.

After this commit, it is possible to overwrite the default value (which is 30 secs) by setting it in API payload. As an example

{
  "callParams": {
    "callUrlInfo": {
      "baseUrl": "$JITSI_HOST",
      "callName": "$JITSI_ROOM?jwt=$TOKEN"
    }
  },
  "componentParams": {
    "type": "SIP-JIBRI",
    "region": "default-region",
    "environment": "default-env"
  },
  "metadata": {
    "sipClientParams": {
      "sipAddress": "sip:jibri@127.0.0.1",
      "displayName": "$DISPLAY_NAME",
      "autoAnswer": true,
      "autoAnswerTimer": 600
    }
  }
}

[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 #509 (d4a7dce) into master (c23529a) will increase coverage by 0.02%. The diff coverage is 50.00%.

Additional details and impacted files

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