Add 'any' type to all function parameters

[gregjacobs]

Can get a weird build error when using ng-packagr on an Angular codebase (Angular 6 with CLI 6.0.8) that doesn't have type annotations on function parameters. Figure this would be fine to do to add the 'any' type for the moment on parameters which seems to fix this issue

function myFn( arg1, arg2 ) {}

Should become:

function myFn( arg1: any, arg2: any ) {}

Will help for people to enable the "noImplicitAny": true option as well.

[gregjacobs]

PRs welcome