feat(browser): Add mode option for the browser session integration

[JPeer264]

closes #18921
closes JS-1526

This adds a new mode option to the BrowserSessionIntegration.

New explained:

• single: A session is created once when the page is loaded. Session is not updated on navigation. This is useful for webviews or single-page apps where URL changes should not trigger new sessions.
• navigation (default): A session is created on page load and on every navigation change

The default is to navigation to not introduce any breaking change

Merge checklist

• Add Sentry Docs issue to add this to the docs

[linear]

JS-1526 Sessions - Provide more options to control session creation

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	25.34 kB	+0.09%	+22 B 🔺
@sentry/browser - with treeshaking flags	23.85 kB	+0.08%	+19 B 🔺
@sentry/browser (incl. Tracing)	42.14 kB	+0.01%	+3 B 🔺
@sentry/browser (incl. Tracing, Profiling)	46.78 kB	+0.01%	+3 B 🔺
@sentry/browser (incl. Tracing, Replay)	80.79 kB	+0.05%	+34 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	70.43 kB	+0.04%	+25 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	85.48 kB	+0.03%	+18 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	97.68 kB	+0.03%	+28 B 🔺
@sentry/browser (incl. Feedback)	42.05 kB	+0.02%	+5 B 🔺
@sentry/browser (incl. sendFeedback)	30.02 kB	+0.04%	+10 B 🔺
@sentry/browser (incl. FeedbackAsync)	35 kB	-0.01%	-3 B 🔽
@sentry/browser (incl. Metrics)	26.45 kB	+0.08%	+21 B 🔺
@sentry/browser (incl. Logs)	26.6 kB	+0.1%	+24 B 🔺
@sentry/browser (incl. Metrics & Logs)	27.27 kB	+0.11%	+29 B 🔺
@sentry/react	27.07 kB	+0.08%	+20 B 🔺
@sentry/react (incl. Tracing)	44.39 kB	+0.06%	+23 B 🔺
@sentry/vue	29.78 kB	+0.07%	+20 B 🔺
@sentry/vue (incl. Tracing)	43.95 kB	+0.05%	+21 B 🔺
@sentry/svelte	25.36 kB	+0.1%	+23 B 🔺
CDN Bundle	27.91 kB	+0.08%	+22 B 🔺
CDN Bundle (incl. Tracing)	42.95 kB	+0.04%	+16 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics)	43.77 kB	+0.05%	+19 B 🔺
CDN Bundle (incl. Tracing, Replay)	79.69 kB	+0.02%	+10 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	85.13 kB	+0.02%	+16 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	86.05 kB	+0.03%	+24 B 🔺
CDN Bundle - uncompressed	81.67 kB	+0.09%	+71 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	127.21 kB	+0.06%	+71 B 🔺
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	130.05 kB	+0.06%	+71 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	243.81 kB	+0.03%	+71 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	256.62 kB	+0.03%	+71 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	259.43 kB	+0.03%	+71 B 🔺
@sentry/nextjs (client)	46.75 kB	+0.05%	+19 B 🔺
@sentry/sveltekit (client)	42.53 kB	+0.05%	+19 B 🔺
@sentry/node-core	52.02 kB	-	-
@sentry/node	166.05 kB	-	-
@sentry/node - without tracing	93.79 kB	-	-
@sentry/aws-serverless	109.31 kB	-	-

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