178 default bot mentor creation for new accounts

[biniyam-29]

• As discussed in out las meeting a mentor (aka moderator aka bot) should be created every time a new account is created.
• A mentor is created is created for each newly created mentor.
• I faced a challenge: what to place in the email, so I decided to concatenate the name of the account with "@leyuchatbot.com" but still that causes another which is what if another account is created so I left that idea but instead I came to conclusion that if the email is concatenated with account id some how it will be unique, so it is like that now

await tx.mentor.create({
        data: {
          name,
          accountId: account.id,
          email: `${account.id}@leyuchatbot.com`,
          isBot: true,
        },
      });