feat(amplify-codegen): add schema compile process in codegen commands

[AaronZyLee]

Issue #, if available:
fix #4882
Description of changes:
Added graphql schema compiling in command amplify codegen, amplify codegen statements and amplify codegen types.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[yuth]

We might need to add a check here to ensure that there is an valid GraphQL API in the project before executing this. The CLI allows customers to add external api using amplify add codegen --apiId <your-api-id>. If the API is an external API, then we download the introspection schema and generate types and statements.

[yuth]

Please add a check to ensure there is an GraphQL API provisioned in the project before executing compileSchema

[yuth]

I would prefer the check rely on existence of a API resource along with looking at the file extension. There is a possibility that the API is removed, but the .graphql.yml file is not updated. You could follow something similar to what we do in mock. Also move the check to an helper method instead of having the same check in 3 different places

amplify-cli/packages/amplify-util-mock/src/api/api.ts

Lines 237 to 253 in eee972f

	private async getAppSyncAPI(context) {
	const currentMeta = await getAmplifyMeta(context);
	const { api: apis = {} } = currentMeta;
	let appSyncApi = null;
	let name = null;
	Object.entries(apis).some((entry: any) => {
	if (entry[1].service === 'AppSync' && entry[1].providerPlugin === 'awscloudformation') {
	appSyncApi = entry[1];
	name = entry[0];
	return true;
	}
	});
	if (!name) {
	throw new Error('No AppSync API is added to the project');
	}
	return name;
	}

[AaronZyLee]

Fair enough. I will add this part to the check

[lgtm-com]

This pull request introduces 1 alert when merging 975abd3 into f8ff81d - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[github-actions]

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