[Feat] diagnosis warn not allow `if` has `:=` (no-cond-assign)

[CoffeeChaton]

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💻 Exp Code

; warn
if (a := b){
}

; ok
a := b
if (a){
}

Additional context

https://eslint.org/docs/latest/rules/no-cond-assign

In conditional statements, it is very easy to mistype a comparison operator as an assignment operator.
There are valid reasons to use assignment operators in conditional statements.
However, it can be difficult to tell whether a specific assignment was intentional.