Remove Assert as a dependency from @Loopback/Filter

[wdunn001]

This library only seems to serve the purpose of doing simple assertions if it was removed the portability of the library would increase (as it would no longer be node dependent) this means it could be moved into any frontend framework without issue and be shared between the front and backend.

This caused this issue in Angular https://github.com/angular/angular-cli/issues/20819