Update custom magic link functions to accept user attributes

[RobHarveyDev]

Issue #, if available: N/A

Description of changes:
Updates the createEmailContent and sendEmailWithLink to accept the user attributes from cognito as additional parameters.

This is to allow customising the email content and sending based on the users details, such as branding.

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[ottokruse]

Nice!

Nitpick/QQ, this looks slightly brittle:

import { StringMap } from "aws-lambda/trigger/cognito-user-pool-trigger/_common";

Is that not available as top level import, or maybe we can extract it with a Parameters<> trick, or even have a Record<str, ?what?>

[ottokruse]

And run prettier please :)

[RobHarveyDev]

Nice!

Nitpick/QQ, this looks slightly brittle:

import { StringMap } from "aws-lambda/trigger/cognito-user-pool-trigger/_common";

Is that not available as top level import, or maybe we can extract it with a Parameters<> trick, or even have a Record<str, ?what?>

Not that I can see. I can change it to be

userAttributes: { [name: string]: string };

instead to avoid the import

[ottokruse]

Not that I can see. I can change it to be

userAttributes: { [name: string]: string };

instead to avoid the import

I like that

[RobHarveyDev]

Is this ok to be merged?

[ottokruse]

Yes thank you.
Need to publish to NPM still, bare with me.