feat: prevent spam

[aldy505]

after sending the captcha, the bot will listen to the incoming message, right?

then it will check whether or not the user id is in the in-memory cache

if they are, check for the following conditions:

• if they send other things than plain text -> warn them to solve the captcha first, then delete their latest message
• if they send a plain text but not a number -> tell them that it's only a number
• if they send a plain text but a number -> goes into the captcha verification logic

also, I added a fix where in which the user leaves the group before finishing the captcha, it will delete all the message that has been sent before.

[elianiva]

tambahin lagi buat angka tapi pake spasi, kasih tau kalo ga perlu spasi, misalnya 1 2 3 4

[aldy505]

tambahin lagi buat angka tapi pake spasi, kasih tau kalo ga perlu spasi, misalnya 1 2 3 4

@elianiva ini.... susah, mending sekalian di omongin kalo bukan number aja kali ya?

[elianiva]

@elianiva ini.... susah, mending sekalian di omongin kalo bukan number aja kali ya?

susah kenapa? kasih cek buat ini aja dulu sebelum Atoi