chore(eslint): eslint warn arrow-body-style (#41)

## Summary
how about eslint `arrow-body-style` warn
If we want to use this rule, I think automation by eslint is better

![Sep-24-2023
22-26-25](https://github.com/fepack/image/assets/61593290/8a7e12ee-dac3-49ad-9baa-47aaa2bce3e9)

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## Checks

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Please check the following:

- [x] I have written documents and tests, if needed.

configs/eslint-config-js/noimport.js

@@ -18,4 +18,7 @@ module.exports = {
       extends: ["plugin:vitest/recommended"],
     },
   ],
+  rules: {
+    "arrow-body-style": ["warn", "as-needed"],
+  },
 };

packages/image/src/extractColors.ts

@@ -8,8 +8,8 @@ interface PaletteOptions {
  * @param {string} imageUrl - The URL of the image.
  * @param {PaletteOptions} [options] - The extraction options.
  */
-export const extractColors = (imageUrl: string, options?: PaletteOptions) => {
-  return loadImageFromUrl(imageUrl)
+export const extractColors = (imageUrl: string, options?: PaletteOptions) =>
+  loadImageFromUrl(imageUrl)
     .then(extractImage)
     .then((data) => {
       if (!data) {
@@ -22,7 +22,6 @@ export const extractColors = (imageUrl: string, options?: PaletteOptions) => {
       const count = options?.colorCount || pixels.length;
       return pixels.slice(0, count);
     });
-};
 
 /**
  * Extracts pixel data from an image.
@@ -47,15 +46,14 @@ const extractImage = (img: HTMLImageElement) => {
  * Loads an image from a given URL.
  * @param {string} url - The URL of the image to load.
  */
-const loadImageFromUrl = (url: string) => {
-  return new Promise<HTMLImageElement>((resolve, reject) => {
+const loadImageFromUrl = (url: string) =>
+  new Promise<HTMLImageElement>((resolve, reject) => {
     const img = new Image();
     img.onload = () => resolve(img);
     img.onerror = reject;
     img.crossOrigin = "Anonymous";
     img.src = url;
   });
-};
 
 /**
  * Filters and extracts relevant pixels from image data based on quality setting.