Goog.require rewriter doesn't work for dynamic imports

[rkirov]

Since we are moving in the direction of supporting tsickle prod output being consumed by nodejs programs, we need to support the goog.require rewrites even for dynamic import (which are technically not supported by the closure's optimizer).

For example, the emit of this code should be
https://github.com/bazelbuild/rules_typescript/blob/master/internal/tsc_wrapped/tsc_wrapped.ts#L285

Or maybe tsickle should be rejecting dynamic imports, in any case it should not be emitting broken requires.