Auto merge of #12877 - zachs18:inline-def-in-macro, r=zachs18

fix: Insert spaces when inlining a function defined in a macro.

(partially) fixes #12860.

This PR (only) addresses the whitespace issue when inlining functions defined in macros.

Additionally, the indentation/spacing is not ideal, but works, e.g.
```rs
macro_rules! define_function {
    () => { fn test_function_macro() {
        if let Some(3) = 3i32.checked_add(0) {
            println!("3 + 0 == 3");
        }
    } };
}
define_function!();
fn main() {
    test_function_macro();
}
// previously became
// ...
fn main() {
    ifletSome(3)=3i32.checked_add(0){println!("3 + 0 == 3");};
}
// now becomes
// ...
fn main() {
    if let Some(3) = 3i32.checked_add(0){
        println!("3 + 0 == 3");

      };
}
```

The `self` -> `this` problem[^this] is (probably?) a separate problem that I am also looking into.

[^this]: As mentioned in [my comment on the above issue](https://github.com/rust-lang/rust-analyzer/issues/12860#issuecomment-1193231766), inlining a method defined in a macro does not properly replace `self` with the new local `this`.

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