feat(schematics): add @sparkles/schematics package

[dherges]

experimental dev tooling

[dherges]

• https://github.com/nrwl/nx/tree/master/packages/schematics/src
• https://github.com/nrwl/nx/blob/master/packages/schematics/src/utils/ast-utils.ts
• https://github.com/nrwl/nx/blob/master/packages/schematics/src/utils/fileutils.ts
• https://github.com/nrwl/nx/blob/master/packages/schematics/src/collection/workspace/index.ts
• https://github.com/nrwl/nx/blob/master/packages/schematics/migrations/update-7-0-0/update-7-0-0.ts
• https://github.com/angular/angular-cli/blob/master/packages/angular_devkit/schematics/tasks/node-package/install-task.ts

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https://nitayneeman.com/posts/making-an-addable-angular-package-using-schematics/