Ability to hint proper parameter names for functional interfaces

I am (re)-using multiple common functional interfaces in my code, and the parameter names sometimes do not properly match the intent. For example `DoubleUnaryOperator` taking a double generically named `operand`.

I believe there could be an annotation hinting the IDE into using our own name
```java
// What is currently suggested
Vec.ZERO.withX(operand -> operand * 5);
// With hint
Vec.ZERO.withX(x -> x * 5);

// Similar example using UnaryOperator
// What is currently suggested
itemBuilder.meta(itemMetaBuilder -> itemMetaBuilder);
// With hint
itemBuilder.meta(metaBuilder -> metaBuilder);
```

The alternative would be creating my own interfaces, which feels a bit unnecessary.

Start by reviewing the existing annotations in the java-annotations repository and the Java functional-interface examples in the issue. Determine the annotation semantics and IDE support needed to provide the requested parameter-name hints. Done means the proposal has a defined design and an implementation path validated against both examples.

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