Release 1.3.0.0

Compatible with OpenSearch 1.3.0

What's Changed

• Add codeowners support to repo by @ryanbogan in #64
• Upgrades plugin to 1.3.0-SNAPSHOT by @eirsep in #73
• Adds test and build workflow for windows by @eirsep in #74
• Adds test and build workflow for MacOS by @eirsep in #76
• Updating CI workflows to run on all branches by @saratvemulapalli in #80
• Delete unused properties file. by @dblock in #85
• Removed explicit junit dependency by @eirsep in #91
• Remove jcenter repository by @eirsep in #94
• Backwards compatibility tests for async search by @bharath-techie in #95
• Build on JDK 8, 11, and 14. by @dblock in #106
• Adding 1.3.0 release notes - (1.3 branch) by @bharath-techie in #109