chore: Add a /assign to automatically assign the issue

[nawinsharma]

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[nawinsharma]

solves #85

[nawinsharma]

@Luson045 please review it?

[Luson045]

i can only get some vague idea of what it is doing can you please explain it properly along with all the command you added @NawinKumarSharma

[nawinsharma]

it will works similar like this:
formbricks/formbricks#3260

If a pr is not assigned to anyone and if they use /assign comment in the comment of the issue, it will automatically get assigned to them. If more than one person tries to assign the same issue, it fails and give another message that it is already assigned.