chore(atomic): add index & lazy-index file in every use case

[alexprudhomme]

https://coveord.atlassian.net/browse/KIT-3923

This PR adds the index.ts & lazy-index.ts file in every sub package of atomic.

It was also required to change how some headless import worked in insight & recommendations to clean up the index files.

@coveo/service-integration @coveo/service-core We need an index.ts & a lazy-index.ts file for every sub package of atomic (commerce, insight, ipx, ...) for the Lit migration and for going forward with Lit. This will enable us to better organize the code and also make it possible for implementers to only import a sub package specifically by doing import '@coveo/atomic/insight' for example.

For insight and recommendations, there were special exports in the index.ts file. I took the time to remove them and rework the imports in the files affected. No functionality is lost, only small refactor.

[github-actions]

Pull Request Report

PR Title

✅ Title follows the conventional commit spec.

Live demo links

• Storybook

• Playwright report

Bundle Size

File	Old (kb)	New (kb)	Change (%)
case-assist	244	244	0
commerce	355.3	355.3	0
search	415.2	415.2	0
insight	406.4	406.4	0
recommendation	256.2	256.2	0
ssr	409	409	0
ssr-commerce	373	373	0

SSR Progress

Use case	SSR (#)	CSR (#)	Progress (%)
search	39	44	89
recommendation	0	4	0
case-assist	0	6	0
insight	0	27	0
commerce	0	15	0

Detailed logs

search : buildInteractiveResult
search : buildInteractiveInstantResult
search : buildInteractiveRecentResult
search : buildInteractiveCitation
search : buildGeneratedAnswer
recommendation : missing SSR support
case-assist : missing SSR support
insight : missing SSR support
commerce : missing SSR support

[louis-bompart]

LGTM, but could you explain to Contributors & component owners what we are doing here?