`EditContext.text` should not extend by default

As far as I know, the EditContext.text is mainly designed for text editors that use the canvas element or choose the "hidden text area" solution. This may be a good fit for them, but that's not always the case.

There are text editors that rely on solutions like Virtual DOM or Custom Elements, and in that case, the text property is unused.

With the current implementation, the text property expands itself, assuming that we would use it. However, when we are not using it, we have to clear it to avoid using extra memory.

editContext.addEventListener("textupdate", () => {
    // Clear the text to avoid unnecessary memory usage
    editContext.updateText(0, editContext.text.length, "");
});

My suggestion is to change the behavior of the text somehow to not expand by default.

Start by reading the EditContext.text and updateText API entry points and any existing textupdate tests; no implementation files or test paths are identified in the issue. Compare the current default expansion behavior with the proposed non-expanding behavior, and confirm that unused text no longer requires manual clearing.