Feature: Use a template to generate the message

[freefd]

To give users more flexibility, frigate-notify could allow them to specify the format of message using templating engines like Jinja2 or Go Templates.

There is an assumption, the user would like to define the individual template for each notifier type.
Since the frigate-notify uses YAML based single configuration file, the template could be built-in as a dedicated top-level configuration section. For example:

frigate:
...
alerts:
...
monitor:
...
template: # or message_template
  telegram: |
    {{ if .event }}
    Detection at {{ .event.StartTime }}
    Camera: {{ .event.Camera }}
    Label: {{ .event.Label }} {{ event.TopScore }}

    {{ if ge (len .event.Zones) 1 }}
    Zone(s): {{ .event.Zones }}
    {{ end }}

    Links: [Camera]({{ .config.ServerUri }}/cameras/{{ .event.Camera }})
    {{- if .event.HasClip }}
    | [Event Clip]({{ .config.ServerUri }}/api/events/{{ .event.ID }}/clip.mp4)
    {{ end }}
    {{ end }}
...

As usual, if no template is specified, a default template will take effect for a particular notifier.

Thank you.

[0x2142]

Added in v0.3.0

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