feat: SLA reports store (#9185)

- Added sla reports actions, getters and mutations.

app/javascript/dashboard/api/slaReports.js

@@ -0,0 +1,72 @@
+/* global axios */
+import ApiClient from './ApiClient';
+
+class SLAReportsAPI extends ApiClient {
+  constructor() {
+    super('applied_slas', { accountScoped: true });
+  }
+
+  get({
+    from,
+    to,
+    assigned_agent_id,
+    inbox_id,
+    team_id,
+    sla_policy_id,
+    page,
+  } = {}) {
+    return axios.get(this.url, {
+      params: {
+        since: from,
+        until: to,
+        assigned_agent_id,
+        inbox_id,
+        team_id,
+        sla_policy_id,
+        page,
+      },
+    });
+  }
+
+  download({
+    from,
+    to,
+    assigned_agent_id,
+    inbox_id,
+    team_id,
+    sla_policy_id,
+  } = {}) {
+    return axios.get(`${this.url}/download`, {
+      params: {
+        since: from,
+        until: to,
+        assigned_agent_id,
+        inbox_id,
+        team_id,
+        sla_policy_id,
+      },
+    });
+  }
+
+  getMetrics({
+    from,
+    to,
+    assigned_agent_id,
+    inbox_id,
+    team_id,
+    sla_policy_id,
+  } = {}) {
+    return axios.get(`${this.url}/metrics`, {
+      params: {
+        since: from,
+        until: to,
+        assigned_agent_id,
+        inbox_id,
+        team_id,
+        sla_policy_id,
+      },
+    });
+  }
+}
+
+export default new SLAReportsAPI();