fix(create-injection-token): allow provideFn to accept factory

[nartc]

Closes #99

No docs yet because my brain is not firing on all cylinders this morning (Insomnia struck last night so I've been up since 2AM). I'll add docs later or @wanoo21 can put some docs 😋.

cc @wanoo21 no docs so you might want to take a look at the new tests in this PR for usage.

For "optional factory" case, I had to add a new function createNoopInjectionToken() instead. Typing is tricky with the optional factory.

// "multi" token; unfortunately until I can acquire better typescript skill, we have to duplicate "true" here
const [injectFn, provideFn] = createNoopInjectionToken<number, true>('description', { multi: true });

injectFn(); // number[]
provideFn(1); // accepts number
provideFn(() => 1); // accepts a factory returning a number

// normal token
const [injectFn, provideFn] = createNoopInjectionToken<number>('description');
injectFn(); // number;

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[wanoo21]

So fast, thanks @nartc, I'll check the source code and test examples this weekend, and I sure can help with docs!

You should take a break, hahaha!

[nartc]

Waiting on @wanoo21 confirmation before merging.

[wanoo21]

I think we're good to go. Let's merge it and I'll update the docs before release.

Should I create a new issue for documentation?