v1.0.0

What's Changed

Removed 'out/opensearchpy' folder which was produced while generating pyi files for plugins by
Merging opensearch-dsl-py to opensearch-py by
Fixed CVE - issue 86 mentioned in opensearch-dsl-py repo
Removing low-level and high-level client terminology by
Added upgrading.md file and updated it for opensearch-py 2.2.0 release by

Full Changelog: opensearch-project/opensearch-py@v2.1.1...v2.2.0