adding elastic-operator-2.12.1 pack (#78)

* adding elastic-operator pack

* removing k8s version hard dependency and fixing chart structure

* adding missing eck-operator chart

---------

Co-authored-by: Vishwanath S <vishwanaths@spectrocloud.com>

packs/elastic-operator-2.12.1/README.md

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+# Elastic Cloud on Kubernetes (ECK)
+
+Elastic Cloud on Kubernetes automates the deployment, provisioning, management, and orchestration of Elasticsearch, Kibana, APM Server, Enterprise Search, Beats, Elastic Agent, Elastic Maps Server, and Logstash on Kubernetes based on the operator pattern.
+
+Current features:
+
+*  Elasticsearch, Kibana, APM Server, Enterprise Search, and Beats deployments
+*  TLS Certificates management
+*  Safe Elasticsearch cluster configuration & topology changes
+*  Persistent volumes usage
+*  Custom node configuration and attributes
+*  Secure settings keystore updates
+
+Supported versions:
+
+*  Kubernetes 1.25-1.29
+*  Elasticsearch, Kibana, APM Server: 6.8+, 7.1+, 8+
+*  Enterprise Search: 7.7+, 8+
+*  Beats: 7.0+, 8+
+*  Elastic Agent: 7.10+ (standalone), 7.14+, 8+ (Fleet)
+*  Elastic Maps Server: 7.11+, 8+
+*  Logstash 8.7+
+
+Check the [Quickstart](https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s-quickstart.html) to deploy your first cluster with ECK.
+
+For general questions, please see the Elastic [forums](https://discuss.elastic.co/c/eck).
+
+# ECK Operator Helm Chart
+
+A Helm chart to install the ECK Operator: the official Kubernetes operator from Elastic to orchestrate Elasticsearch, Kibana, APM Server, Enterprise Search, and Beats on Kubernetes.
+
+For more information about the ECK Operator, see:
+- [Documentation](https://www.elastic.co/guide/en/cloud-on-k8s/current/index.html)
+- [GitHub repo](https://github.com/elastic/cloud-on-k8s)
+
+
+## Requirements
+
+- Supported Kubernetes versions are listed in the documentation: https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s_supported_versions.html
+
+## Usage
+
+Refer to the documentation at https://www.elastic.co/guide/en/cloud-on-k8s/current/k8s-install-helm.html

packs/elastic-operator-2.12.1/pack.json

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+{
+    "addonType": "logging",
+    "annotations": {
+      "commit_msg": "Elastic Cloud on Kubernetes (ECK) operator",
+      "source": "community",
+      "contributor" : "spectrocloud"
+    },
+    "charts": [
+      "charts/eck-operator-2.12.1.tgz"
+    ],
+    "cloudTypes": [
+      "all"
+    ],
+    "displayName": "ECK Operator",
+    "layer":"addon",
+    "name": "elastic-operator",
+    "version": "2.12.1"
+}