[Feature]: Generate summarized single-file data with `brief:writeDataJson`

[kwonoj]

What problem does this feature solve?

I may misunderstand, but brief mode's writeDataJson seems to like emit full analytics to generate the output html. For the processing in the remote system (CI, for example) hope if there's a simplified single json file instead.

What does the proposed API look like?

Mainly I'm intererested in few metrics like

• build size : total, js, assets, Record<filename, {type, size}>
• build time: span for the event { eventType, started, completed, parent }

if it's possible, brief mode have an option to accept which information to be included in summary but can't say for sure what type of values can be easily picked.

[easy1090]

Thanks~ Good idea!I will add this feature as soon as possible this month.