Add aria-* labels to make editor more accessible

[VarunSriram99]

While working on neeto-editor with Playwright, we noticed that a few commands such as fill were not working. This was because the editor did not fall under the roles of <input> or <textarea> and is not a [contenteditable] tag. The same can be an issue with accessibility as screen readers might not identify the editor to be a text field. Adding the proper aria labels should help resolve this issue and improve the testing experience as well.

@AbhayVAshokan _a
enhancement _t

[AbhayVAshokan]

@gaagul _a