Missing TaskModifier and TaskFactory type definitions in v5

[jrmlt]

In v4, there was no issue using registerModifier with TypeScript. In v5, however, types are no longer correctly inferred.

v4	v5

It can also be seen in this example snippet:

ember-concurrency/packages/test-app/app/task-modifiers/benchmark.js

Line 5 in eb011b0

function benchmarkModifier(taskFactory, option) {

When using TypeScript, the type of the taskFactory is not inferred, and properties like name, taskDefinition, or setTaskDefinition are not recognized.