feat(node): No-code init via `--import=@sentry/node/init`

[timfish]

Closes #11997

[github-actions[bot]]

size-limit report 📦

Path	Size
@sentry/browser	21.72 KB (0%)
@sentry/browser (incl. Tracing)	32.88 KB (0%)
@sentry/browser (incl. Tracing, Replay)	68.23 KB (0%)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	61.61 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas)	72.27 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.3 KB (0%)
@sentry/browser (incl. Feedback)	37.71 KB (0%)
@sentry/browser (incl. sendFeedback)	26.29 KB (0%)
@sentry/browser (incl. FeedbackAsync)	30.69 KB (0%)
@sentry/react	24.41 KB (0%)
@sentry/react (incl. Tracing)	35.87 KB (0%)
@sentry/vue	25.66 KB (0%)
@sentry/vue (incl. Tracing)	34.69 KB (0%)
@sentry/svelte	21.86 KB (0%)
CDN Bundle	24.26 KB (0%)
CDN Bundle (incl. Tracing)	34.31 KB (0%)
CDN Bundle (incl. Tracing, Replay)	68 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback)	73 KB (0%)
CDN Bundle - uncompressed	71.33 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	101.74 KB (0%)
CDN Bundle (incl. Tracing, Replay) - uncompressed	211.36 KB (0%)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	223.72 KB (0%)
@sentry/nextjs (client)	35.09 KB (0%)
@sentry/sveltekit (client)	33.46 KB (0%)
@sentry/node	134.23 KB (+0.04% 🔺)
@sentry/aws-serverless	128.22 KB (+0.04% 🔺)