feat: Support for Plugins

[TurtIeSocks]

This PR adds a plugin system to Koji that supports plugins for bootstrapping, clustering, and routing.

The plugin system has been documented extensively on the docs site so I'll only detail codebase changes in this PR. Those curious about the functionality should view this branch's docs.

Overview

• Adds a plugin folder in each of the 3 respective categories folders that users can drop individual files or folders into
• When starting up a session in the client, these directories are read from and it generates the plugin list on demand
• You do not need to recompile or even restart Koji to update the functionality of your plugin, since it is called on demand, in a child process
• While this PR is not breaking, you must recompile the TSP binary upon pulling, this is because the file location has moved and you should be doing this after every update anyway. See docs for a full updating script.

Client Changes

• Modifies the existing number input field to be a general text input field as well, to support adding custom args to each respective plugin

Server Changes

• Adds the Plugin struct that is used for all 3 algorithm categories.
• Reworks some deserializing of certain args to now account for any possible string
• Breaks the Basic Sorting traits into smaller traits
• Makes the joining logic used by route_split_level a little more generic
• Default for route_split_level is now 0 instead of 1

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Name	Status	Preview	Comments	Updated (UTC)
koji	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 28, 2024 7:47pm

[clburlison]

Reviewed the docs only and they make sense to me. I didn't test the code or attempt to create my own plugin (no time 😅 )