Add const parameter keyword completion

Example
---
```rust
fn foo<c$0>() {}
```
->
```rust
fn foo<const $1: $0>() {}
```

src/tools/rust-analyzer/crates/ide-completion/src/completions.rs

@@ -691,6 +691,9 @@ pub(super) fn complete_name(
         NameKind::RecordField => {
             field::complete_field_list_record_variant(acc, ctx);
         }
+        NameKind::TypeParam => {
+            acc.add_keyword_snippet(ctx, "const", "const $1: $0");
+        }
         NameKind::ConstParam
         | NameKind::Enum
         | NameKind::MacroDef
@@ -700,7 +703,6 @@ pub(super) fn complete_name(
         | NameKind::Static
         | NameKind::Struct
         | NameKind::Trait
-        | NameKind::TypeParam
         | NameKind::Union
         | NameKind::Variant => (),
     }

src/tools/rust-analyzer/crates/ide-completion/src/tests/special.rs

@@ -1510,3 +1510,28 @@ fn foo<T>() {
         "#]],
     );
 }
+
+#[test]
+fn fn_generic_params_const_param_snippet() {
+    check_edit("const", "fn foo<c$0>() {}", "fn foo<const $1: $0>() {}");
+    check_edit("const", "fn foo<T, c$0>() {}", "fn foo<T, const $1: $0>() {}");
+    check(
+        r#"
+fn foo<T: $0>() {}
+"#,
+        expect![[r#"
+            kw crate::
+            kw self::
+        "#]],
+    );
+    check(
+        r#"
+fn foo<const N: $0>() {}
+"#,
+        expect![[r#"
+            bt u32 u32
+            kw crate::
+            kw self::
+        "#]],
+    );
+}