fix(textarea): add reflect option to disabled and readonly props

[KillerCodeMonkey]

Reflect readonly and disabled properties at ion-textarea host element.

Issue number: resolves #30911

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What is the current behavior?

When setting readonly or disabled those settings are only reflected deep inside the ion-textarea component at the native textarea element.

Since there is no predefined readonly class it is hard to select readonly/disabled ion-textareas.

What is the new behavior?

Readonly and disabled props are reflected at ion-textarea host element.
Like they are for ion-inputs.
So it is consistent and will be helpful for easy element selection of disabled/readonly textareas (css, querySelector).

Does this introduce a breaking change?

• Yes
• No

Other information

• /

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