[Feature]: Implement hasAttribute(String)

🚀 Feature Request

I want to check if a locator has an attribute.
I think that's what toHaveAttribute(name) is doing in typescript.

I tried to:
assertThat(getInputLocator()).not().hasAttribute("min", ""); // that will forbid empty min but not a filled value
or
assertThat(getInputLocator()).not().hasAttribute("min", Pattern.compile(".*"));

And the result is:

• unexpected value "undefined"

With a new API hasAttribute(String attributeName), I would be able to do:
assertThat(getInputLocator()).not().hasAttribute("min");

That will test if there is an attribute min.

Example

import com.microsoft.playwright.assertions.PlaywrightAssertions;
import java.util.regex.Pattern;

Locator el = page.locator("#my-el");

// Assert the attribute is NOT present:
PlaywrightAssertions.assertThat(el)
    .not()
    .hasAttribute("min", Pattern.compile(".*"));

Motivation

The only workaround I found is to get the attribute and asserts it's null. But it's not the good practice.

Having that will help to check to the absence of a attribute.

Start at the Java assertion entry point shown in the issue, PlaywrightAssertions.assertThat, and inspect the existing hasAttribute overloads. Confirm how locator attribute absence is represented and add the requested String-only form so presence and absence can be asserted without a value; done means the API supports the shown .not().hasAttribute("min") usage.