When asking a question in #ask-for-help, suggest some similar questions already raised

[PetitPotiron]

Is your feature request related to a problem? Please describe.
No problem, it's just a feature

Describe the solution you'd like
As we now have threads instead of multiples channels to help people, it may be interesting to suggest some similar questions already raised in the channel.
There is one way to do this:

• Get the title of the question being asked
• Compare this title to all archived threads names
• Select the thread which has the most similarity beetween its name and the new question's name
• Send a link to this thread in ephemeral message

Buy the way, we can transform the system to get the title of the question (which transforms the permissions of the channel) to a [modal](https://guide.disnake.dev/interactions/modals).