feat: Add ide-assist: generate_try_from_repr_for_enum

[A4-Tacks]

Close #22273

Add a TryFrom<{repr}> impl for this enum.

Example

#[repr(u32)]
enum Foo {
    A = 1$0,
    B = 1 << 1,
}

->

#[repr(u32)]
enum Foo {
    A = 1,
    B = 1 << 1,
}

impl TryFrom<u32> for Foo {
    type Error = ();

    fn try_from(value: u32) -> Result<Self, Self::Error> {
        match value {
            1 => Ok(Self::A),
            2 => Ok(Self::B),
            _ => Err(()),
        }
    }
}