Refactor code structure for improved readability and maintainability

feat: add JASSUB type definitions and update common.js references

feat: add JASSUB plugin for advanced subtitle rendering in HTML5 video

- Implemented a new JASSUB class for handling subtitle rendering with options for video and canvas targets.
- Added support for both synchronous and asynchronous rendering modes.
- Integrated Web Worker for offloading rendering tasks, improving performance.
- Included methods for managing subtitle tracks, styles, and events.
- Added color space verification and handling to ensure accurate subtitle display.
- Implemented local font access for enhanced typography options in subtitles.
- Introduced a benchmarking feature to assess rendering performance.

refactor: update README and type definitions for artplayer-plugin-jassub

- Removed installation and usage instructions from README.md for clarity.
- Updated index.js to remove direct assignment of jassub instance to art.
- Enhanced type definitions in artplayer-plugin-jassub.d.ts to include detailed JassubOption and JassubInstance interfaces.

packages/artplayer-plugin-jassub/types/artplayer-plugin-jassub.d.ts

@@ -1,13 +1,37 @@
-import type Artplayer from 'artplayer';
+import type Artplayer from 'artplayer'
 
-interface Option {
-    //
+export interface JassubOption {
+  workerUrl: string
+  wasmUrl: string
+  modernWasmUrl: string
+  subUrl?: string
+  subContent?: string
+  timeOffset?: number
+  debug?: boolean
+  prescaleFactor?: number
+  prescaleHeightLimit?: number
+  maxRenderHeight?: number
+  fonts?: string[] | Uint8Array[]
+  availableFonts?: Record<string, Uint8Array | string>
+  fallbackFont?: string
+  useLocalFonts?: boolean
+  libassMemoryLimit?: number
+  libassGlyphLimit?: number
+  [key: string]: any
+}
+
+export interface JassubInstance {
+  resize: (force?: boolean, width?: number, height?: number, top?: number, left?: number) => Promise<void>
+  setVideo: (video: HTMLVideoElement) => Promise<void>
+  destroy: () => Promise<void>
+  [key: string]: any
 }
 
 interface Result {
-    name: 'artplayerPluginJassub';
+  name: 'artplayerPluginJassub'
+  instance: JassubInstance
 }
 
-declare const artplayerPluginJassub: (option: Option) => (art: Artplayer) => Result;
+declare const artplayerPluginJassub: (option: JassubOption) => (art: Artplayer) => Result
 
-export default artplayerPluginJassub
+export default artplayerPluginJassub