Add logic to parse data attributes on treeview plugin

[dfsmania]

Add changes on src/ts/treeview.ts file to parse next data attributes in order to configure the treeview plugin from HTML markup.

• data-accordion
• data-animation-speed

The data-accordion was already used in the source code, see file src/html/components/dashboard/_sidenav.astro at line 35, but it was never parsed by the plugin:

<ul
  class="nav sidebar-menu flex-column"
  data-lte-toggle="treeview"
  role="menu"
  data-accordion="false"
>

As a sidenote, what the status of this package @REJack @danny007in , are you guys still working on it? I'm curious because I'm working on an integration of AdminLTE v4 for Laravel and I need to know what to expect on the future around this package...

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