[refactor] Better integrated logger.

[yoannmoinet]

What and why?

Our logger is a bit simplistic, it needs to be better integrated into the ecosystem.
Especially with the build-report to report errors and warnings.
As well as a simpler initialisation for plugins.

How?

• Move the logger factory into the global context.
• Store all logs in build-report.
• Fix errors/warnings in esbuild and webpack build reports.
• Add tests.
• Factorise some mocks.
• Add some logs in hope to better understand test's race condition.