For small amounts of data, symbol plists are the most efficient (space
and time wise) as data access gets in Emacs. Hash tables, though O(1),
impose a minimum threshold of overhead before it becomes the efficient
option, but this benefit won't be obvious for datasets of at least 60 or
less.
Since modulep! is used *a lot*, and used to determine a module's
state (and state of its flags), there is a benefit to caching it.
Still, this is only a read-only cache, and does not replace the
`doom-modules` hash-table, which will always be the preferred interface
for the rest of the module API.
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