Minor refactoring and improvement

[niladam]

This pull request is just a minor refactoring doing the following:

1. Renames the service provider from ServiceProvider to AirLSTCoreServiceProvider;
2. Replaces boolval with (bool) since the latter is 6x faster (and also reduces cognitive load);
3. Adds installation instructions along with config publishing instructions.
4. Fixes the previous instructions that used an incorrect namespace for the facade class.
5. Makes use of throw_unless helper in Laravel to simplify the WorkerCreator class.

[niladam]

Since i didn't have any instructions on how the pull request should be made (via a develop branch for example) i decided to make the pull request against the master one. If that goes against your guidelines you can of course simply merge this in an entirely different branch :)

@orkhanahmadov @mThallerWeb if you have any questions i'll gladly answer them :)

[niladam]

Also, please note that this is a breaking change since the name of the service provider has been changed, so it's not backwards compatible and therefore i think it requires at least a minor version change (so it's not a patch). Personally i would suggest 0.1.0.