Autoformat should handle more separator characters

[maxbarnas]

📝 Provide a description of the improvement

Currently, the autoformat requires a whitespace character to precede a delimiter. To make it more usable and more in line with popular Markdown specifications, we should handle more characters, specifically, punctuation marks.

Example cases to support:

• typing * in foo **bar*^. or **foo*^, bar.
• typing * in foo (**bar*^.
• typing * in foo (*^bar**).

Useful insights regarding Markdown specification and punctuation characters can be found in a related ticket.

Proper handling of all the characters might need this ticket to be done first: #8629.

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