fix: withFilter types

[sevrai]

Thank you for the release of the V3. Nonetheless, we encoutered issues while migrating to it with Apollo v4 and graphql-codegen.

Types exposed for withFilter function do not match its implementation:

• TSource of the filter function is the value returned by the asyncIterator
• parameters are optionnal in types but required ligne 18. Is there a reason for this signature ?

[apollo-cla]

@sevrai: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[sevrai]

Hello @tninesling,

Could you please take a look of this issue?
Migrating to 3.0 of in our stack is proving to be quite challenging.

Thank you in advance for your time.