[Request] Identify and index plugins by package name, not plugin name

[wheaney]

Please confirm

• I have searched existing issues
• This issue is not a duplicate of an existing one
• This is not a request for a plugin

Feature Request Description

I recently tried to "rebrand" my plugin by changing its name (as defined in plugin.json's name property) and it created a duplicate plugin in the store. It's been a couple months since I tested this, so I'm not 100% certain anymore, but I think it also would prevent decky from detecting that there's an update for an installed plugin, because it would treat it as a new plugin. In contrast to this, the installation process creates a plugin directory based on the package name (or repo name, not sure which), so I believe it wouldn't install as a second plugin because it would overwrite the old one. This package name should be used to uniquely identify the plugin throughout the whole stack, allowing devs to rename a plugin and still get a smooth update experience for existing users.

Further Description

No response