A simple textarea field

### Default example

```jsx live=true
() => {
  const [value, setValue] = React.useState("");
  return (
    <TextArea
      value={value}
      placeholder={"Type something here"}
      onChange={e => {
        setValue(e.target.value);
      }}
    />
  );
};
```

### Invalid state

```jsx live=true
() => {
  const [value, setValue] = React.useState("Some text...");
  return (
    <TextArea
      value={value}
      isValid={false}
      onChange={e => {
        setValue(e.target.value);
      }}
    />
  );
};
```