Fix not applicable c-str and byte-str for raw_string

[A4-Tacks]

Example

Assist: make_raw_string

fn f() {
    let s = $0b"random\nstring";
}

->

fn f() {
    let s = br#"random
string"#;
}

---

Assist: make_raw_string

fn f() {
    let s = $0c"random\nstring";
}

->

fn f() {
    let s = cr#"random
string"#;
}

---

Assist: add_hash

fn f() {
    let s = $0cr"random string";
}

->

fn f() {
    let s = cr#"random string"#;
}

---

Assist: remove_hash

fn f() {
    let s = $0cr#"random string"#;
}

->

fn f() {
    let s = cr"random string";
}

---

Assist: make_usual_string

fn f() {
    let s = $0cr#"random string"#;
}

->

fn f() {
    let s = c"random string";
}

[ShoyuVanilla]

Looks good 👍 But could this be migrated to use SyntaxEditor as well?

[A4-Tacks]

The current implementation can replace quotation marks separately instead of string tokens

Using SyntaxEditor requires replacing the string token

[ShoyuVanilla]

Yeah, but we should eventually get rid of mutable syntax tree usages. Though this PR achieves solid improvement without much changes but the added lines won't directly work with the new API so I think it would be better to migrate it as well