Convert contexts set on scope to segment span attributes

[Lms24]

Besides contexts being applied directly in event processors, we need to transform contexts set onto scopes to segment span attributes. For example, when our SDK calls scope.setContext() or Sentry.setContext().

I suggest we do this in applyScopeToSegmentSpan in captureSpan. I gave this a try in the PoC implementation, though it still includes flat-mapping arbitrary context keys. This, we'll not do for now (see below). However, there are alternatives, like registering a client.on('processSegmentSpan', ...) hook in the respective call sites and adding the attribute there directly. The advantage is co-location, the trade off un-tree-shakeable code.

Note: there are some attributes missing from Sentry-conventions which we'll need to add there as well.

Explicitly out of scope:

• Arbitrary context keys or sub objects set by users. We only transform what our SDK (+integrations) sets. User-set contexts are out of scope for now. This also applies to sub-keys set on known contexts. For example: contexts.app.version is known and converted to a segment span attribute. contexts.app.user-bought-dlc is not known and hence not converted. Neither is contexts.dogs.awesome.
• Setting these attributes on child spans

setContext calls:

• packages/angular/src/sdk.ts
• packages/aws-serverless/src/sdk.ts (2x)
• packages/browser/src/profiling/startProfileForSpan.ts
• packages/browser/src/profiling/UIProfiler.ts (3x)
• packages/bun/src/integrations/bunserver.ts
• packages/cloudflare/src/scope-utils.ts (2x)
• packages/core/src/trpc.ts
• packages/core/src/integrations/supabase.ts
• packages/deno/src/wrap-deno-request-handler.ts
• packages/google-cloud-serverless/src/gcpfunction/cloud_events.ts
• packages/google-cloud-serverless/src/gcpfunction/events.ts
• packages/node-core/src/utils/ensureIsWrapped.ts
• packages/profiling-node/src/integration.ts (3x)
• packages/react/src/redux.ts
• packages/react/src/sdk.ts
• packages/vue/src/pinia.ts

[linear-code]

JS-2221