Move Configuration logic to Async::Service.

[ioquatix]

Async::Service provides a generic service interface. We adopt that model, with some glue code to retain backwards compatibility. This ultimately increases the generic nature of falcon's "application host" capabilities, while also reducing the "bespoke" nature of configuration.

In addition, this removes the dependency on build-environment, which reduces the namespace pollution.

Types of Changes

• New feature.
• Breaking change.

Contribution

• I added tests for my changes.
• I tested my changes locally.
• I agree to the Developer's Certificate of Origin 1.1.