feat: new multiple tabs solution for web phone

[embbnux]

Core idea:

1. Web phone connection is only connected in first opened tab.
2. When user have a call in second tab, voice transmission is happened in first tab. Second tab only has web phone UI.
3. When user control call in second tab, control command sent to first tab to execute (Maybe we can use call control RESTful API in future).
4. When user close first tab, second tab becomes first opened tab. Web phone will be connected in this tab.
5. Web phone states is shared with local storage between different tabs.
6. Use localStorage as a message channel between different tabs.