fix(templates/express): dynamically import chokidar so it doesn't crash production

[mcansh]

prior to this change if you built the remix app, pruned dev only dependencies and attempted to npm start the server would bail as it tried to import chokidar

Closes: #

• Docs
• Tests

Testing Strategy:

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[MichaelDeBoey]

I think we should merge this into main + we should probably also update dev_v2 docs with this

[ngbrown]

This was also solved in #6922 (see review), along with making CJS easy to switch to and fixing a race condition.

[brophdawg11]

As a template change I agree this should go to main - but we should hold off until v2 releases since I think the express server is pretty different in main (v1 dev server) and dev (v2 dev server).

[mcansh]

rebased!

i originally opened this PR before v2 went out which is the reason for it being pointed to dev, not really in the mood to go through the whole git rebase --onto main dev (git branch --show-current) --committer-date-is-author-date shooting match to keep this PR but repoint it to main so if that's desired instead of merging + cherrypicking this one, i can close and bring it over to a new PR pointed to main

edit: the following did the trick without too much effort

pbcopy < ./templates/express/server.js
git checkout main
git pull
git checkout -
git reset main --hard
pbpaste > ./templates/express/server.js
git rebase --onto main dev (git branch --show-current) --committer-date-is-author-date
git push --force-with-lease