feat(core): Support stream responses and tool calls for Google GenAI

[RulaKhaled]

✅ This PR depends on #17625 and it should be reviewed only after that one is merged.

This PR adds:

1. Streaming support for Google GenAI sdk instrumenting the following methods:

   1. Models API Streaming

      • models.generateContentStream() - Stream content generation with real-time chunks

   2. Chat API Streaming (chats.create)

      • chat.sendMessageStream() - Stream chat responses with conversation context

2. New tool calls attributes

   • GEN_AI_REQUEST_AVAILABLE_TOOLS_ATTRIBUTE - Captures available tools from requests
   • GEN_AI_RESPONSE_TOOL_CALLS_ATTRIBUTE - Captures function calls from responses

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	24.23 kB	-	-
@sentry/browser - with treeshaking flags	22.75 kB	-	-
@sentry/browser (incl. Tracing)	40.42 kB	-	-
@sentry/browser (incl. Tracing, Replay)	78.8 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	68.45 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	83.47 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	95.67 kB	-	-
@sentry/browser (incl. Feedback)	40.95 kB	-	-
@sentry/browser (incl. sendFeedback)	28.89 kB	-	-
@sentry/browser (incl. FeedbackAsync)	33.82 kB	-	-
@sentry/react	25.95 kB	-0.02%	-5 B 🔽
@sentry/react (incl. Tracing)	42.39 kB	-	-
@sentry/vue	28.75 kB	-	-
@sentry/vue (incl. Tracing)	42.23 kB	-	-
@sentry/svelte	24.26 kB	-	-
CDN Bundle	25.75 kB	-	-
CDN Bundle (incl. Tracing)	40.31 kB	-	-
CDN Bundle (incl. Tracing, Replay)	76.55 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	82.06 kB	-	-
CDN Bundle - uncompressed	75.3 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	119.31 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	234.47 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	247.23 kB	-	-
@sentry/nextjs (client)	44.4 kB	-	-
@sentry/sveltekit (client)	40.84 kB	-	-
@sentry/node-core	50.47 kB	-0.01%	-2 B 🔽
@sentry/node	154.09 kB	+0.34%	+520 B 🔺
@sentry/node - without tracing	92.33 kB	-0.01%	-1 B 🔽
@sentry/aws-serverless	106.03 kB	-0.01%	-2 B 🔽

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[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.
⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	8,707	-	8,569	+2%
GET With Sentry	1,325	15%	1,326	-0%
GET With Sentry (error only)	6,007	69%	5,842	+3%
POST Baseline	1,182	-	1,140	+4%
POST With Sentry	501	42%	490	+2%
POST With Sentry (error only)	1,046	88%	1,024	+2%
MYSQL Baseline	3,304	-	3,199	+3%
MYSQL With Sentry	441	13%	507	-13%
MYSQL With Sentry (error only)	2,671	81%	2,580	+4%

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