Add support for custom tags in sentry logs

### Problem Statement

currently custom tags and contexts are only available on sentry issues.
I would like to be able to set custom tags on the logs. (python sdk)
(similar to: https://github.com/getsentry/sentry/issues/98044)

### Solution Brainstorm

_No response_

### Product Area

Other

No files, tests, or entry points are named. Start by tracing how the Python SDK creates and sends Sentry logs, then compare its handling of custom tags and contexts with issues; done means custom tags can be set on logs and tests verify they are transmitted.

Written by the indexing model from the issue text.