Remove alpha dimension token & Add alpha radius token (#2540)

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## Self Checklist

- [x] I wrote a PR title in **English** and added an appropriate
**label** to the PR.
- [x] I wrote the commit message in **English** and to follow [**the
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specification**](https://www.conventionalcommits.org/en/v1.0.0/).
- [x] I [added the
**changeset**](https://github.com/changesets/changesets/blob/main/docs/adding-a-changeset.md)
about the changes that needed to be released. (or didn't have to)
- [x] I wrote or updated **documentation** related to the changes. (or
didn't have to)
- [x] I wrote or updated **tests** related to the changes. (or didn't
have to)
- [x] I tested the changes in various browsers. (or didn't have to)
  - Windows: Chrome, Edge, (Optional) Firefox
  - macOS: Chrome, Edge, Safari, (Optional) Firefox

## Related Issue

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<!-- Fixes #0000 -->

## Summary

<!-- Please brief explanation of the changes made -->

Remove alpha dimension token & Add alpha radius token

## Details

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- 스펙 변경에 따라 내부적으로만 alpha dimension 토큰은 디자인 토큰에서 제거했습니다.
- alpha radius 토큰을 추가했습니다.
- alpha button에서 사용하던 dimension 토큰을 radius로 변경했습니다.
- 데스크에 dimension 토큰 몇 사용처가 있어서, 버전 업데이트할 때 유의해야합니다.

### Breaking change? (Yes/No)

<!-- If Yes, please describe the impact and migration path for users -->

No (alpha version)

## References

<!-- Please list any other resources or points the reviewer should be
aware of -->

- Figma Variable 참고

.changeset/flat-birds-relax.md

@@ -0,0 +1,5 @@
+---
+'@channel.io/bezier-tokens': patch
+---
+
+The alpha version dimension token is removed. The alpha version radius token is added.

packages/bezier-react/src/components/AlphaButton/Button.module.scss

@@ -177,11 +177,11 @@ $chromatic-colors: 'blue', 'red', 'green', 'cobalt', 'orange', 'pink', 'purple';
   /* border-radius */
   &:where(.variant-primary, .variant-secondary, .variant-tertiary) {
     $border-radius-by-size: (
-      xs: var(--alpha-dimension-6),
-      s: var(--alpha-dimension-7),
-      m: var(--alpha-dimension-10),
-      l: var(--alpha-dimension-12),
-      xl: var(--alpha-dimension-14),
+      xs: var(--alpha-radius-6),
+      s: var(--alpha-radius-7),
+      m: var(--alpha-radius-10),
+      l: var(--alpha-radius-12),
+      xl: var(--alpha-radius-14),
     );
 
     @each $size, $border-radius in $border-radius-by-size {

packages/bezier-react/src/components/AlphaIconButton/IconButton.module.scss

@@ -159,11 +159,11 @@ $chromatic-colors: 'blue', 'red', 'green', 'cobalt', 'orange', 'pink', 'purple';
   /* border-radius */
   &:where(.shape-rectangle) {
     $border-radius-by-size: (
-      xs: var(--alpha-dimension-6),
-      s: var(--alpha-dimension-7),
-      m: var(--alpha-dimension-10),
-      l: var(--alpha-dimension-12),
-      xl: var(--alpha-dimension-14),
+      xs: var(--alpha-radius-6),
+      s: var(--alpha-radius-7),
+      m: var(--alpha-radius-10),
+      l: var(--alpha-radius-12),
+      xl: var(--alpha-radius-14),
     );
 
     @each $size, $border-radius in $border-radius-by-size {

packages/bezier-react/src/components/AlphaToggleButton/ToggleButton.module.scss

@@ -29,7 +29,7 @@
   }
 
   &:where(.shape-rectangle) {
-    border-radius: var(--alpha-dimension-10);
+    border-radius: var(--alpha-radius-10);
   }
 
   &:where(.shape-capsule) {

packages/bezier-tokens/src/alpha/global/radius.json

@@ -0,0 +1,60 @@
+{
+  "radius": {
+    "2": {
+      "value": "2px",
+      "type": "dimension"
+    },
+    "3": {
+      "value": "3px",
+      "type": "dimension"
+    },
+    "4": {
+      "value": "4px",
+      "type": "dimension"
+    },
+    "6": {
+      "value": "6px",
+      "type": "dimension"
+    },
+    "7": {
+      "value": "7px",
+      "type": "dimension"
+    },
+    "8": {
+      "value": "8px",
+      "type": "dimension"
+    },
+    "10": {
+      "value": "10px",
+      "type": "dimension"
+    },
+    "12": {
+      "value": "12px",
+      "type": "dimension"
+    },
+    "14": {
+      "value": "14px",
+      "type": "dimension"
+    },
+    "16": {
+      "value": "16px",
+      "type": "dimension"
+    },
+    "20": {
+      "value": "20px",
+      "type": "dimension"
+    },
+    "32": {
+      "value": "32px",
+      "type": "dimension"
+    },
+    "rounded-half": {
+      "value": "9999px",
+      "type": "dimension"
+    },
+    "smooth-corner": {
+      "value": "42%",
+      "type": "dimension"
+    }
+  }
+}