export options types and interfaces

[trev-gulls]

Summary

Describe the goal of this PR. Mention any related Issue numbers.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #872 (780c3e8) into main (4365f45) will not change coverage.
The diff coverage is n/a.

❗ Current head 780c3e8 differs from pull request most recent head e176ea3. Consider uploading reports for the commit e176ea3 to get more accurate results

@@           Coverage Diff           @@
##             main     #872   +/-   ##
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  Coverage   66.08%   66.08%           
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  Files          13       13           
  Lines        1200     1200           
  Branches      353      353           
=======================================
  Hits          793      793           
  Misses        338      338           
  Partials       69       69           

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[seratch]

Thanks @trevor-gullstad - this pull request already looks great to me 👍 After waiting for other maintainers' response, we can merge this PR shortly.

[stevengill]

Thanks for the pr @trevor-gullstad!!

[trev-gulls]

Thanks @seratch and @stevengill when can I expect to see these changes reflected in a new release?

[seratch]

@trevor-gullstad We are still working on a few other tasks for the next release: https://github.com/slackapi/bolt-js/issues?q=is%3Aissue+is%3Aopen+milestone%3A3.4.0
We haven't decided the date for the next release yet but it won't take long.