feat(api): support for custom email sender trigger

[kylefix]

hello sir,

this PR adds (partial) support for the CustomEmailSender trigger for these trigger sources:

CustomEmailSender_SignUp
CustomEmailSender_ResendCode 
CustomEmailSender_ForgotPassword
CustomEmailSender_UpdateUserAttribute
CustomEmailSender_VerifyUserAttribute
CustomEmailSender_AdminCreateUser

also partially addresses #102 by saving the e-mail as a UserAttribute when the UserPool is configured with UsernameAttributes: ['email']

lmk if there is anything I overlooked

Thank you for this great tool, really awesome codebase!

[jagregory]

Thanks @kylefix this looks great! Sorry for the slow response, GitHub seems to periodically stop sending me notifications about this repo for some reason 🤷

I'll have a proper review tonight and will merge, but looks good so far. Thanks

[github-actions]

🎉 This PR is included in version 3.18.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• Docker
• GitHub release

Your semantic-release bot 📦🚀