Support saveWebArchive

[CaryTrivett]

Is your feature request related to a problem? If so, Please describe.

Sometimes you want to save the current webview as a web archive.

Describe the solutions you came up with

webview ref add new api

webviewRef.current.saveWebArchive(filename)

Add a new command

   "saveWebArchive" -> {
          val path = args.getString(0)
          webView.saveWebArchive(path)
        }

Additional context

[CaryTrivett]

I can submit a PR to fulfill this requirement

[github-actions]

Hello 👋, this issue has been opened for more than 2 months with no activity on it. If the issue is still here, please keep in mind that we need community support and help to fix it! Just comment something like still searching for solutions and if you found one, please open a pull request! You have 7 days until this gets closed automatically