Report suppressed exceptions as exception group

[adinauer]

📜 Description

Report exceptions returned by Throwable.getSuppressed() to Sentry as exception groups. They show up like this:

Links can be clicked and take you to the exception on the same page.

💡 Motivation and Context

Fixes #542

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- Report suppressed exceptions as exception group ([#3396](https://github.com/getsentry/sentry-java/pull/3396))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

Generated by 🚫 dangerJS against 18ad266

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	449.88 ms	525.45 ms	75.57 ms
Size	1.70 MiB	2.28 MiB	595.99 KiB

Previous results on branch: feat/hsm-42c-suppressed-exceptions

Startup times

Revision	Plain	With Sentry	Diff
0a61517	394.71 ms	454.42 ms	59.71 ms
37d1e27	379.49 ms	423.67 ms	44.18 ms
99b5ed4	386.04 ms	460.83 ms	74.79 ms
25e1771	383.98 ms	459.50 ms	75.52 ms
1c2fbfe	403.73 ms	463.84 ms	60.11 ms
a23c145	396.22 ms	458.98 ms	62.76 ms
702ae01	403.63 ms	476.15 ms	72.51 ms
c822b54	431.59 ms	549.47 ms	117.88 ms
0c124b6	382.98 ms	458.90 ms	75.92 ms

App size

Revision	Plain	With Sentry	Diff
0a61517	1.70 MiB	2.28 MiB	595.98 KiB
37d1e27	1.70 MiB	2.28 MiB	595.95 KiB
99b5ed4	1.70 MiB	2.28 MiB	595.99 KiB
25e1771	1.70 MiB	2.28 MiB	595.98 KiB
1c2fbfe	1.70 MiB	2.28 MiB	595.99 KiB
a23c145	1.70 MiB	2.28 MiB	595.97 KiB
702ae01	1.70 MiB	2.28 MiB	595.97 KiB
c822b54	1.70 MiB	2.28 MiB	595.97 KiB
0c124b6	1.70 MiB	2.28 MiB	595.97 KiB

[rodolfoBee]

Do we have an ETA for when it can be merged and released?

[adinauer]

@rodolfoBee since we're merging this into 8.x it might be a couple weeks until we release an early alpha of 8.x as we want to include some changes around Performance powered by OTel.

[adinauer]

@rodolfoBee we just discussed this internally and we're planning to merge this sooner and do an alpha release without Performance powered by OpenTelemetry. Just need to prepare some things for the release.

[lbloder]

LGTM 👍