Feature: add K8S probes checker API

[Lancetnik]

We should provides users with an ability to check application health in a some way. It can be reached by using multiple mechanism, so we can create a base Checker Protocol and use it the following way

app = FastStream(broker)
app.add_checker(
     SocketChecker("/sock"),
     # HTTPChecker(port=8000),
     # ...
)

And check all of them by the same command

faststream probe main:app

So, we can create multiple checkers for various cases and user can implement any checker by itself in the same time

• add broker.ping() unified method
• add BaseCheker using broker.ping()
• implement HTTPChecker (inheritor of BaseCheker)
• add CLI command to use any checker

[Lancetnik]

Assigned to @Sehat1137

[danb27]

I would love this feature! +1

[Lancetnik]

reassigned to @chudomozg