perf: introduce samples option; introduce only option; aggregate …

[bartveneman]

…with Welfords online algo instead of sorted array

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 4.93kB (5.14%) ⬆️⚠️, exceeding the configured threshold of 5%.

Bundle name	Size	Change
analyzeCss-esm	100.76kB	4.93kB (5.14%) ⬆️⚠️

Affected Assets, Files, and Routes:

view changes for bundle: analyzeCss-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
css-*.js	4.93kB	100.76kB	5.14% ⚠️

Files in css-*.js:

• ./src/transfer.ts → Total Size: 885 bytes

• ./src/options.ts → Total Size: 266 bytes

• ./src/index.ts → Total Size: 37.45kB

• ./src/context-collection.ts → Total Size: 1.4kB

• ./src/aggregate-collection.ts → Total Size: 1.51kB

• ./src/collection.ts → Total Size: 1.76kB