Alert name and message size limits

The following limits are currently applied:

• 300 characters is the maximum length of an alert name.
• 4000 characters is the maximum length of the message specified in the "Message" field of the alert creation dialog.
• 40960 characters is the maximum length of the message specified in PineScript's alert() function or in the "alert_message" argument.

The same limits apply to the request body size as to the alert message size.

Please note that emojis are encoded in multiple bytes, so one emoji counts as several characters.