export interceptor to type def file

[jakecastelli]

Fixes: #3308

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[mcollina]

Thanks for opening a PR! Can you please add a unit test? we use tsd for typescript

[jakecastelli]

Sure, thanks for letting me know! Added a unit test to verify the behaviour.

Test would fail without the export to def file

> [email protected] test:typescript
> tsd && tsc --skipLibCheck test/imports/undici-import.ts

test/imports/undici-import.ts:2:10 - error TS2614: Module '"../../"' has no exported member 'interceptors'. Did you mean to use 'import interceptors from "../../"' instead?

2 import { interceptors } from '../../'
           ~~~~~~~~~~~~


Found 1 error in test/imports/undici-import.ts:2

I added a dummy call interceptors.createRedirectInterceptor({}) just to ensure member can be accessed without any type error, not sure if its necessary.

[mcollina]

lgtm

[mcollina]

@metcoder95 ptal