Expose option to select subnets for deployment of HealthMonitor

[ddneilson]

As the title says, expose a SubnetSelection option in the HealthMonitor construct.

Use Case

Building out a bespoke subnet topology where there may be many private subnets, but a dedicated subnet specifically for workers & its health monitor. Network traffic between subnets is tightly controlled by network access control lists.

Proposed Solution

Follow the usual vpcSubnets pattern that's followed in all of the other constructs. The option should control the placement of the load balancers.

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

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This is a 🚀 Feature Request