Support HTTP paths/routes configuration

[epomatti]

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Tell us about your request
Add simple reverse proxy URL filter functionality to allow/deny some paths, possibly with a custom response.

Example:

• Allow: /api/v2/**
• Return 404: /actuator/health

Essentially, incorporate the equivalent of ELB routing rules to expand the customization of the service.

Describe alternatives you've considered
Today everything needs to be managed inside the app, and adding a load balancer in front of App Runner doesn't look like a good approach.