[Tracker] Implement all relevant tags that moonwave supports

[PhantomShift]

Implement all of the following tags
* indicates that tags are parsed but does not yet generate proper documentation

Doc Comments

• class
• within
• property
• type
• interface
• function

Tag

• tag

Function

• yields
• param
• return
• error

Usage tags

• unreleased
• since
• deprecated

Realm tags

• server
• client
• plugin

Visibility tags

• private
• ignore

Property tags

• readonly

Class tags

• __index

Experimental

• external

[PhantomShift]

Notably, the external tag is wholly useless for Moonreader since Studio can't link to external web pages aside from Roblox's documentation but should still be parsed. On the other hand, consideration for the tag tag is needed to make it useful.