fix: Add exports to build customer declaration files for combine schema

[zxl629]

Related issues:

• "A type annotation is necessary" for auth and schema. #496

Description of changes:
This change expands the tests originally created by @stocaaro. It introduces a new e2e test application that fails to build due to missing exports needed to construct customer *.d.ts project files.

The change then introduces the missing exports to @aws-amplify/data-schema needed to get this build to work.

Example of why we need this:

Customers with combine schema get compiler errors when they enable declarations in their compilerOptions:

const schema = a.schema({
  Todo: a
    .model({
      content: a.string(),
    })
    .authorization((allow) => [allow.guest()]),
});
const sqlSchema = generatedSqlSchema.authorization(allow => allow.guest());
const combinedSchema = a.combine([schema, sqlSchema]);

Results in the compile error:
The inferred type of 'buildCombineSchema' cannot be named without a reference to '../node_modules/@aws-amplify/data-schema/dist/esm/CombineSchema'. This is likely not portable. A type annotation is necessary.

This change adheres to the rules regarding new exported types to prevent breaking changes:

• We must no remove functions
• We must not add un-defaulted Generics
• We must not add required param shape options

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[changeset-bot]

🦋 Changeset detected

Latest commit: ea98fbe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
integration-tests	Patch
@aws-amplify/data-schema	Patch

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