Add multi-root workspace configuration file (#2505)

Currently, to make LSP servers like Ruby LSP properly work for gem, like
`sentry-ruby`, we need to open `/sentry-ruby` separately. When working on
tasks across multiple gems, like `sentry-ruby` and `sentry-rails`, it requires
2 separate VS Code windows while each can not interact with each other.

For example, when using `Debug` code lens provided by Ruby LSP in `sentry-rails`'s
tests, we can put breakpoints inside `sentry-rails`'s codebase, but not in `sentry-ruby`.

But if we open the project through this new workspace configuration file,
the multi-root workspace feature in VS Code will allow us to

- Access code across multiple gems
- Debug code with VS Code across multiple gems
- Run language servers independently for each gem

Author: st0012

CONTRIBUTING.md

@@ -17,6 +17,11 @@ You can contribute to this project in the following ways:
 
 And if you have any questions, please feel free to reach out on [Discord].
 
+## Develop This Project With Multi-root Workspaces
+
+If you use editors that support [VS Code-style multi-root workspaces](https://code.visualstudio.com/docs/editor/multi-root-workspaces),
+such as VS Code, Cursor...etc., opening the editor with `sentry-ruby.code-workspace` file will provide a better development experience.
+
 ## Contribute To Individual Gems
 
 - Install the dependencies of a specific gem by running `bundle` in it's subdirectory. I.e:

sentry-ruby.code-workspace

@@ -0,0 +1,30 @@
+{
+    "folders": [
+        {
+            "path": "sentry-ruby"
+        },
+        {
+            "path": "sentry-rails"
+        },
+        {
+            "path": "sentry-sidekiq"
+        },
+        {
+            "path": "sentry-delayed_job"
+        },
+        {
+            "path": "sentry-resque"
+        },
+        {
+            "path": "sentry-opentelemetry"
+        },
+        {
+            "path": ".github"
+        }
+    ],
+    "extensions": {
+        "recommendations": [
+            "Shopify.ruby-lsp"
+        ]
+    }
+}