Release notes 1.3.0.0

New features:

• Configurable metric prefix [#10]
  New static setting prometheus.metric_name.prefix allows to set custom metric prefix. The default value is opensearch_.
  This can be a 💥BREAKING CHANGE💥 for some users! You can set it to the original value es_, for instance when there are other systems that rely on the original metric names.

• Introduced Nodes filter [#22]
  New dynamic setting prometheus.nodes.filter determines which nodes are included in NodesStats requests. The default value is set to _local which means that only the local node NodesStats data is included in response to a scraping request hitting the node (this is how it has been working so far).
  This setting can be set to any valid nodes filter value, for example setting it to _all value will include all cluster nodes NodesStats data in scraping response. This can be useful in situations when Prometheus can scrape every single cluster node.

Bug fixes:

• Fixed integration tests [#2]
  OpenSearch ITs use different cluster name. All relevant integration tests have been updated.

Improvements & Maintenance:

• Added gradle wrapper support [#5]
• Prometheus Simple Java Client upgraded [#23]
• Removed use of deprecated index types from integration tests [#6]