export ICourierClient from main

[jrweingart]

Description of the change

-ICourierClient now exported from main entry point

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers mentioned in a comment
• Changes have been reviewed by at least one other engineer
• Issue from task tracker has a link to this pull request

[linear]

C-2235 Export ICourierClient

Small ask - can you export the type ICourierClient from @trycourier/courier? We’re using typescript and now we have to import it from @trycourier/courier/lib/types which feels flaky