Feat: add missing features compared to Bungee

[webmass]

Hi,
Thanks for the plugin, works great!

Some nice to have features currently missing in the widget but existing on Bungee:

• show USD (or customizable currency) worth when possible of the input token and output token
• "switch" input and output chain/token
• "Top coins" section, on Bungee a few selected tokens are shown in priority below the searchbar and above token list, would be very nice to have a feature like this and be able to specify the priority list

Other convenient features that could be added:

• includeTokens, adds 1-X tokens to the default list (or custom list url/object if provided)
• excludeTokens, removes 1-X tokens from the default list (or custom list url/object if provided)
  Most of the time the default list enough, but small protocols may just want to add their tokens to it instead of providing a full custom list.