feat(argocd-notifications): Add slack icon and signingSecret support and Grafana support (#384)

* Add icon and signingSecret support

* Fix typo

* Add grafana support

* Fix trailing spaces

* Fix trailing spaces 2

* Fix grafana comments

* Add bot manifests

* Bump version

* No new line character

* Values.yaml new line character

* Add comments

* Add slack.enabled flag

* Move slack bot to bots/slack folder

Co-authored-by: sergeyshaykhullin <sergeyshaykhullin@gmail.com>
Co-authored-by: Sergey Shaykhullin <46970457+sergeyshaykhullin@users.noreply.github.com>

charts/argocd-notifications/templates/bots/slack/service.yaml

@@ -0,0 +1,15 @@
+{{ if .Values.bots.slack.enabled }}
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "argocd-notifications.name" . }}-bot
+spec:
+  ports:
+  - name: server
+    port: 80
+    protocol: TCP
+    targetPort: 8080
+  selector:
+    {{- include "argocd-notifications.bots.slack.selectorLabels" . | nindent 4 }}
+  type: {{ .Values.bots.slack.service.type }}
+{{ end }}