feat(reflect): added support for static methods reflection

[pierissimo]

Changes included

Add support for the reflection of static methods in a class.

#1022

[ktutnik]

Sorry for the delay, finally I can cleanup all the test errors on the master branch.

First, I see possible breaking change if I apply this.

Currently now Plumier scan for kind: Method for each action under the controller, with this feature. If any of the controllers have some static methods it will be identified as a route handler (action), this behavior would break the existing functionality.

I suggest that it's better to use kind: StaticMethod and remove the isStatic property, what do you think?

Second, I propose to move the test under tests/behavior/reflect/class.spec.ts and create more scenarios:

1. Should be able to inspect class static method (test a static function without parameters and return void)
2. Should be able to inspect static method's parameters
3. Should be able to inspect static metho's return type.

Big thanks for your contribution.

[pierissimo]

hey @ktutnik, I'll implement the changes you mentioned.

Following the same model, even the support for StaticProperties could be introduced in the future.

[ktutnik]

@pierissimo I investigate this feature deeply and found that its more complex than I thought. Then I decided to collaborate on this, and refactor some of my old code to make it cleaner.

I added some abilities, besides the features you added.

1. Ability to reflect static method without decorators.
2. Ability to distinguish static vs instance with the same name
3. Ability to reflect static property & getter and setter

I invited you as an outside collaborator, if you have time please help to review my code.

[pierissimo]

@ktutnik this is awesome, thank you for the help.
Of course, I'll have a look at the changes and provide feedback!

[pierissimo]

Looks good to me