Next developer team add worker groups

[brandonjbjelland]

PR o'clock

Description

KOPS allows for creating multiple worker autoscaling groups each with different specifications (e.g. instance_type, asg size, userdata). This change allows for that same use case while still providing a default worker ASG if none are given. Security group IDs can also be provided for both workers and the cluster for better control over these aspects of the set up.

This finishes out the work of #12

While no more variable inputs are needed or any changed that are required, this is a breaking change as input for workers now takes on a new form.

Checklist

• terraform fmt and terraform validate both work from the root and examples/eks_test_fixture directories (look in CI for an example)
• Tests for the changes have been added and passing (for bug fixes/features) - I'd like to have 2 sets of tests here, one that tests a barebones instantiation of the module and another that provides the kitchen sink worth of extra options.
• Test results are pasted in this PR (in lieu of CI)
• Docs have been added/updated (for bug fixes/features)
• Any breaking changes are noted in the description above

[brandonjbjelland]

Also wraps up: #11

[github-actions]

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