feat: social auth codegen

[Sanayshah2]

Description of changes

Social auth codegen implementation (Google, Facebook, Amazon, Apple)

Description of how you validated changes

Unit tests to validate that expected keywords are present in generated source code. Manually verified against a deployed app and checked if the code is being generated correctly with enabled social auth option.

Checklist

• [x] PR description included
• [x] yarn test passes
• [x] Tests are changed or added
• [x] Relevant documentation is changed or added (and PR referenced)
• [x] New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies
• [x] Pull request labels are added

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