Support multiple receiver decorators on one static method

[ahnpnl]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Support request => https://github.com/ngxs/store/blob/master/CONTRIBUTING.md
[ ] Other... Please describe:

Current behavior

Current multiple @Receiver can't be used on one static method. This is not the case with @Action where multiple @Action can be used on one non-static method. There is an error throwing out in the console.

Expected behavior

@Receiver should have similar usage as @Action

Minimal reproduction of the problem with instructions

• Clone this repo
• Install dependencies with yarn.
• Run ng serve.
• Observe the error in the console

What is the motivation / use case for changing the behavior?

It will be for users to switch from @Action to @Receiver or vice versa without changing much of their codebase. In some situations users might want to listen to 2 different emitters but those emitters can have the same logic of updating state.

Environment

Libs:
- @angular/core version: 8.2.14
- @ngxs/store version: 3.5.1


Browser:
- [x] Chrome (desktop) version XX
- [ ] Chrome (Android) version XX
- [ ] Chrome (iOS) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: 10.17.0  
- Platform:  Windows 10 64bit

Others:
N.A.