Update AI Studio Plugin Docs

[walkerlj0]

Update the Plugins Docs with the links to the third party plugins that can be used with Hedera Agent Kit:

• Saucer Swap Plugin by blockydevs
• Bonzo Finance Plugin
• Memejob Plugin by Builder Labs
• CoinCap Plugin for js and for py
• Michael Kantor's Registry Broker Plugin

Also include the ElizaOS Plugin (note that this is a plugin for ElizaOS, not a plugin for HAK)

Also add in a disclaimer that these are third party plugins - we have a link to a reviewed plugin, but users should use at their own risk. These plugins may contain security vulnerabilities and may interact with outside platforms such as exchanges that pose their own risks
(TBD actual messaging, per feedback from security team)