[Feature]: simplify rsbuild dev-related configurations

[9aoy]

What problem does this feature solve?

There are some duplications between dev and tools.devServer configurations, and some modern.js tools.devServer configurations are not yet supported by rsbuild.

in modern.js：

so, we will merge some tools.devServer into dev, and remove support for tools.devServer.

What does the proposed API look like?

configuration changes

• tools.devServer.watch
• tools.devServer.liveReload
• tools.devServer.before (use dev.setupMiddlewares.unshift instead)
• tools.devServer.after (use dev.setupMiddlewares.push instead)
• tools.devServer.hot (use dev.hmr instead)
• tools.devServer.https (use dev.https instead)
• tools.devServer.client => dev.client
• tools.devServer.setupMiddlewares => dev.setupMiddlewares
• tools.devServer.proxy => dev.proxy
• tools.devServer.compress => dev.compress
• tools.devServer.devMiddleware => dev.devMiddleware
• tools.devServer.headers => dev.headers
• tools.devServer.historyApiFallback => dev.historyApiFallback