fix(examples): make alarm email optional and add README instructions

[jusiskin]

Problem

#373 added code in the AWS-All-in-Basic example to allow configuring an email address to which operational alarm notifications are sent. The intention was to have this optional and when not specified, no alarms would be configured. In the TypeScript version of the example, this was not made optional and anyone using it would need to modify the code. This new configuration setting was not documented in the README.md files.

Solution

• Made the property optional in the TypeScript example
• Added a step to both the Python and TypeScript README.md to optionally populate this configuration setting

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[ddneilson]

Thanks for filling the gap that I left behind, Josh.