All parameters NotNull/Nullable

This's a kind feature request,

instead of doing
```java
public void MethodName(@NotNull Arg arg1, @NotNull Arg arg2, @NotNull Arg arg3) {}
```
It's better to be:
```java
@ArgsNotNull
public void MethodName(Arg arg1, Arg arg2, Arg arg3) {}
```
Indicating all parameters should not be null (or nullable).

Thanks.

Start by reviewing the existing NotNull and Nullable annotations and how this repository represents annotations for JVM-based languages. Determine how a method-level annotation could express the requested parameter behavior, including the nullable variant, and define completion as a supported annotation design with documented semantics and appropriate validation.

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