feat(typescript-react-apollo): export config type

[namoscato]

Description

Export typescript-react-apollo's ReactApolloRawPluginConfig to enable strict typing in a GraphQL configuration module.

Related #1169

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Something like this should work via a built package:

/**
 * @returns {import('@graphql-codegen/typescript-react-apollo').ReactApolloRawPluginConfig}
 */
function createCodegenPluginConfig() {

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules