[Bug][Feature] Move compiler giving a warning or error for unknown attributes

[junkil-park]

🐛 Bug

The Move compiler currently ignores unknown attributes. For example, the following code uses #[testonly] which is a typo of #[test_only]. This can leak some test-only code into the production.

aptos-core/aptos-move/framework/aptos-stdlib/sources/math64.move

Line 254 in 9773481

#[testonly]

#[testonly]
    /// For functions that approximate a value it's useful to test a value is close
    /// to the most correct value up to last digit
    fun assert_approx_the_same(x: u128, y: u128, precission: u64) {
        if (x < y) {
            let tmp = x;
            x = y;
            y = tmp;
        };
        let mult = (pow(10, precission) as u128);
        assert!((x - y) * mult < x, 0);
    }

[brmataptos]

This redundant with #8875

[brmataptos]

duplicate of #8875.