Send integrations list as metadata

[marandaneto]

Problem Statement

Right now we only send the sdk packages but not integrations

Solution Brainstorm

sentry-java/sentry/src/main/java/io/sentry/protocol/SdkVersion.java

Lines 47 to 54 in 74deb43

	/**
	* List of integrations that are enabled in the SDK. _Optional._
	*
	* <p>The list should have all enabled integrations, including default integrations. Default
	* integrations are included because different SDK releases may contain different default
	* integrations.
	*/
	private @Nullable List<String> integrations;

So we can learn about the usages of our integrations

[romtsn]

Dupe of #1885?