Added support for Jira, Pagerduty and Increased Slack to include webooks and custom fields

[0xrob]

I've created some Custom alert_action to add additional support for pagerduty and Jira.

I have a feeling these applications are popular enough that this feature would benefit the wider contentctl community.

I've attached some images if you'd like to see a POC.

PagerDuty

Jira

This code can be tested by adding the alert_action key in the yaml file. See below

alert_action: jira: account: JiraServiceAccount jira_attachment: enabled_json jira_dedup: enabled jira_dedup_content: your condition jira_description: your description jira_issue_type: Alert jira_priority: Three jira_priority_dynamic: your dynamic priority jira_project: your project jira_summary: your summary pagerduty: pagerduty_description: your description integration_url_override: optional pagerduty url slack: channel: your channel message: your message fields: outputted fields webhook_url: webhookurl

This is my first PR with contentctl so let me know what else i need to add or supply.