5577e4e3b1
feat: do not add new enum if it already exists
## Summary
This PR introduces a check for the existence of another enum within the current scope, and if it exist, we skip `add_enum_def`.
## Why?
Currently, when using the `bool_to_enum` assist more than once, it is possible to add multiple enum definitions. For example, the following snippet,
```rs
#[derive(PartialEq, Eq)]
enum Bool {
True,
False,
}
fn main() {
let a = Bool::True;
let b = true;
println!("Hello, world!");
}
```
will be transformed into,
```rs
#[derive(PartialEq, Eq)]
enum Bool {
True,
False,
}
#[derive(PartialEq, Eq)]
enum Bool {
True,
False,
}
fn main() {
let a = Bool::True;
let b = Bool::True;
println!("Hello, world!");
}
```
This can be annoying for users to clean up.
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