add next() to express template, closes #1593

[ericwooley]

closes #1593

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Potential Problems With The Approach

Technically this could be considered a breaking change, but IMO it should be considered a bug fix.

Test plan

I added an in memory boolean to the express server, added routes to check/modify that boolean, and a middleware which modifies the bool after the register routes. The tests first set that boolean to false, then, after a route has run through tsoa, checks that the boolean was modified by the middleware.

[github-actions]

Hello there ericwooley 👋

Thank you and congrats 🎉 for opening your first PR on this project.✨

We will review the following PR soon! 👀

[ericwooley]

Hi @lukeautry

Just wanted to check in and see if this got lost in the shuffle