feat: add keepalive runtime

[xiaohuoni]

在 app.ts 中配置

export function getKeepAlive(keepaliva: any[]) {
  // 会传入当前的配置值
  return [/users/];
}

Closes: #398

[changeset-bot]

🦋 Changeset detected

Latest commit: 5d2b45f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@alita/plugins	Patch
alita	Patch
@alita/native	Patch

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