ref(utils): Split normalization code into separate module

[lobsterkatie]

This splits the normalization functions and tests into their own files, as object.ts and its tests had become quite unwieldy.

(This is extracted from an upcoming PR, in order to reduce noise there.)

[github-actions]

size-limit report

Path	Base Size (1379591)	Current Size	Change
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.49 KB	19.51 KB	+0.1% 🔺
@sentry/browser - ES5 CDN Bundle (minified)	62.17 KB	62.13 KB	-0.06% 🔽
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.12 KB	18.12 KB	+0.03% 🔺
@sentry/browser - ES6 CDN Bundle (minified)	55.5 KB	55.49 KB	-0.02% 🔽
@sentry/browser - Webpack (gzipped + minified)	22.6 KB	22.66 KB	+0.26% 🔺
@sentry/browser - Webpack (minified)	79.21 KB	79.3 KB	+0.12% 🔺
@sentry/react - Webpack (gzipped + minified)	22.63 KB	22.69 KB	+0.27% 🔺
@sentry/nextjs Client - Webpack (gzipped + minified)	47.6 KB	47.69 KB	+0.18% 🔺
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.37 KB	25.39 KB	+0.11% 🔺
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	23.72 KB	23.73 KB	+0.06% 🔺