Release 2.19.0

What's Changed

• update appinsights agent version and move it to pom.xml by @ahmedmuhsin in #808
• Remove signatures in-place from AppInsights agent jar before adding it to worker package by @ahmedmuhsin in #810
• [Preview] SDK types - BlobClient and BlobContainerClient by @ahmedmuhsin in #813

Full Changelog: 2.18.0...2.19.0