chore(spec2cdk): refactor to make it easier to extend

[rix0rrr]

The spec2cdk tool was originally written to generate every service submodule insularly.

We want to now extend it to emit structures into a new shared submodule. In order to do that, this refactors the generator to have a more shared, mutable object-oriented design which will be easier to share state in.

The core of the change looks like this:

// Old
for (const service of services) {
  const module = AstBuilder.forService(service);

  const writer = new TsFileWriter();
  writer.write(module);
}

// New
const ast = new AstBuilder();
for (const service of service) {
  ast.addService(service);
}

const writer = new TsFileWriter();
ast.writeAll(writer);

• Make the API based more around mutable objects with shared state.
• Remove the specific ServiceModule, ResourceModule classes, because they were adding no benefit over the generic Module.
• Simplify the API around file name patterns, because they were being overly flexible and annoying to work with for no real benefit.

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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