Add test that generates a Daybreak program from AST nodes

Since the AST is a data representation of any valid Daybreak program, a program can be made with the AST types and functions.

The test should be trivial at first and as the AST design settles, we can add more complex examples which demonstrate generating ASTs and compiles the programs from user input or a given spec.

Locate the AST types and functions, then trace the compiler entry point for a program built from them. Add a trivial test that constructs an AST and compiles the resulting Daybreak program; done means the test demonstrates this path and passes.

Written by the indexing model from the issue text.