Allow FieldFunctionOptions to be passed as Type Argument for FieldPolicy

[VictorGaiva]

Checklist:

• If this PR is a new feature, please reference an issue where a consensus about the design was reached (not necessary for small changes)
• Make sure all of the significant new logic is covered by tests

Description

Allows FieldFunctionOptions definition to be passed down to FieldPolicy, FieldReadFunction and FieldMergeFunction so it can be manually defined by the developer.

Use case

Would allow apollo-client-helpers plugin to specify TArgs for each FieldPolicy, currently defined as any.

[apollo-cla]

@VictorGaiva: 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/

[benjamn]

Looks great—thanks @VictorGaiva!