Implement GitHub Projects

### Problem Statement

We have multiple private GitHub projects that contain issues for one or more repositories (for example a general "support" project). When adding an issue to GitHub in Sentry, it's not possible to immediately link the issue to one or multiple projects.

### Solution Brainstorm

It would be cool to be able to directly link the issue to one or multiple projects in the Sentry popup. Ideally even set a status per project.

### Product Area

Issues

We want to define a set of [lightweight metrics]() that SDKs can automatically collect for e.g. framework, language or platform, focusing only on signals that **do NOT overlap with Tracing**. Ideally these metrics should give a quick sense of app or runtime health, … while deeper investigation will still rely on traces or profiles.

Examples**:**

* Node.js runtime metrics (e.g., event loop delay, heap usage)
* Prisma-related metrics in Next.js
* Mobile CPU / memory usage to help surface potential ANRs or app hangs

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**Candidate Metrics (add more below)**

* …

*(please also add ideas, questions or examples in comments)*