Feature: Create a custom resource to manage solr configset

[swarupdonepudi]

Feature:

Currently there is no way to upload configset for a solrcloud created using SolrCloud resource.

It would be nice if configsets for solrclouds are also managed by the solr-operator

Current Alternative:

Currently we are using https://lucene.apache.org/solr/guide/8_2/configsets-api.html solr api to upload a configset. One big limitation with the solr configs-api is that it is not possible to update an existing configset previously uploaded. Workaround is to create a new configset and reload collections to use the new configset as described here - https://dev.lucene.apache.narkive.com/HI7lTF0o/jira-created-solr-12925-configsets-api-should-allow-update-of-existing-configset#post4

It is possible to upload configset directly to zookeeper. However, we would need a zookeeper library in golang which is capable of uploading a config folder to a zookeeper instance. using solj library which is written in java.

The best zk client/sdk in golang seems to be https://github.com/samuel/go-zookeeper/tree/master/zk but from the initial looks it does not seem like it has capability to upload config to zookeeper.