Add lambda variable defaults (still allows overrides)

[dmannarino]

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• [x] Make sure you are requesting to pull a topic/feature/bugfix branch (right side). Don't request your master!
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Pull request type

Please check the type of change your PR introduces: - [ ] Bugfix - [ ] Feature - [ ] Code style update (formatting, renaming) - [x] Refactoring (no functional changes, no api changes) - [ ] Build related changes - [ ] Documentation content changes - [ ] Other (please describe): ## What is the current behavior?

• The runtime, memory size, and timeout of the various lambdas are hardcoded per-environment, which requires one to make an updates in multiple places.

Issue Number: N/A

What is the new behavior?

• Defaults (and correct types) are added for lambda properties. Overrides are still easy.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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