feat: Textarea 컴포넌트 및 스토리북 추가

src/components/Textarea/Textarea.tsx

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+import styled from '@emotion/styled';
+import { HTMLAttributes } from 'react';
+
+import { convertCSS } from '../../utils/convertCSS';
+
+interface Props extends HTMLAttributes<HTMLTextAreaElement> {
+  width?: string | number;
+  height?: string | number;
+  padding?: string;
+}
+
+const TextArea = styled.textarea<Props>`
+  box-sizing: border-box;
+  width: ${({ width }) => (width && convertCSS(width)) || '100%'};
+  height: ${({ height }) => (height && convertCSS(height)) || '100px'};
+  border-radius: 6px;
+  padding: ${({ padding }) => padding || '11px 16px'};
+  font-size: ${({ theme }) => theme.font.suit14r.fontSize}px;
+  font-weight: ${({ theme }) => theme.font.suit14r.fontWeight};
+  border: 1px solid ${({ theme }) => theme.color.l2};
+  outline: none;
+  color: ${({ theme }) => theme.color.b4};
+  background: ${({ theme }) => theme.color.w1};
+
+  &:focus {
+    border-color: ${({ theme }) => theme.color.c1};
+  }
+`;
+
+export default TextArea;

src/stories/Textarea.stories.tsx

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+import { Meta, StoryObj } from '@storybook/react';
+
+import Textarea from '../components/Textarea/Textarea';
+import { ChangeEvent, useEffect, useState } from 'react';
+
+const meta = {
+  title: 'Components/Textarea',
+  component: Textarea,
+  tags: ['autodocs'],
+  argTypes: {
+    width: {
+      control: 'text',
+      description: 'Textarea 컴포넌트의 넓이를 지정합니다.',
+    },
+    height: {
+      control: 'text',
+      description: 'Textarea 컴포넌트의 높이를 지정합니다.',
+    },
+    padding: {
+      control: 'text',
+      description: 'Textarea 컴포넌트 padding을 설정합니다.',
+    },
+    value: {
+      control: 'text',
+      description: 'Textarea 컴포넌트의 텍스트를 나타내는 값입니다.',
+    },
+    onChange: {
+      control: false,
+      description:
+        'Textarea 컴포넌트의 value를 변경할 수 있는 onChange 함수입니다.',
+    },
+  },
+} as Meta<typeof Textarea>;
+
+export default meta;
+type Story = StoryObj<typeof Textarea>;
+
+export const Default: Story = {
+  args: {
+    width: '100%',
+    height: '100px',
+    padding: '11px 16px',
+    value: 'textarea',
+  },
+  render: ({ value, width, height, padding }) => {
+    const userInput = value as string;
+    const [textarea, setTextarea] = useState<string>(userInput);
+
+    useEffect(() => {
+      setTextarea(userInput);
+    }, [userInput]);
+
+    return (
+      <>
+        <Textarea
+          value={textarea}
+          width={width}
+          height={height}
+          padding={padding}
+          onChange={(e: ChangeEvent<HTMLTextAreaElement>) =>
+            setTextarea(e.target.value)
+          }
+        />
+      </>
+    );
+  },
+};