✨feat(awsmachinepool): custom lifecyclehooks for machinepools

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What type of PR is this? /kind feature

What this PR does / why we need it:

This PR adds to the v1beta2 definition for the AWSMachinePool and AWSManagedMachinePool with a new field lifecycleHooks which is a list of:

name: <the name of the lifecycle hook>
notificationTargetARN: <ARN of resource where to send the lifecycle event; optional>
roleARN: <ARN of role to be used when sending notifications; optional>
lifecycleTransition: <autoscaling:EC2_INSTANCE_LAUNCHING/EC2_INSTANCE_TERMINATING>
heartbeatTimeout: <duration of the heartbeat timeout; optional>
defaultResult: <CONTINUE/ABANDON; optional>
notificationMetadata: <some metadata to add to the notification; optional>

The matching webhooks are updated to validate the lifecycle hooks as they are added to the Custom Resource. The matching reconcilers are updated to enable reconciling those lifecycle hooks: if the lifecycle hook is present in the Custom Resource but not in the cloud, it is created. And if there is a lifecycle hook present in the cloud but not declared in the Custom Resource then it is removed.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #4020

AWS supports Lifecycle Hooks before/after performing certain actions on an ASG. For example, before scaling in (removing) a node, the ASG can publish an event in an SQS queue which can them be consumed by the node-termination-handler to ensure its proper removal from Kubernetes (it will cordon, drain the node and wait for a period of time for applications to be removed before allowing the Autoscaling Group to terminate the instance).

This allows Kubernetes or other components to be aware of the node's lifecycle and take appropriate actions

Special notes for your reviewer:

Checklist:

• [x] squashed commits
• [ ] includes documentation
• [x] includes emojis
• [x] adds unit tests
• [x] adds or updates e2e tests

Release note:

Adding support for custom Lifecycle Hooks in AWSMachinePools for external hooks (e.g support for the aws-node-termination-handler with SQS)