compose: streamlined infra generation

[weikanglim]

The current generation for compose uses a combination of text/template and a context struct that represents the deployment metadata. We want a more scalable model that reduces the generation context for a given resource and streamlines generation.

Some items on the wishlist:

1. Default flowing of parameters in the Bicep module
2. Supporting existing resources references vs. AVM module creation
3. Support partial synth

It should aim to improve readability, code reviews, and authoring experience. An ideal authoring workflow is the ability to ingest a fully synthesized Bicep into scaffolded generation assets and requires fewer manual tweaks.

The minimum requirements are:

1. Overall cost of development (author time, review time, validation time) for an addition of 1 resource should be logarithmic with respect to number of resources supported in composability for us to scale. Ideally, it's a constant cost -- but the Bicep module constructs may be the limitation here.