[ruby-core:116163] [Ruby master Feature#20177] Optimized $LOADED_FEATURES.include?

Issue #20177 has been reported by palkan (Vladimir Dementyev).

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Feature #20177: Optimized $LOADED_FEATURES.include?
https://bugs.ruby-lang.org/issues/20177

* Author: palkan (Vladimir Dementyev)
* Status: Open
* Priority: Normal
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I'd like to propose adding the optimized `$LOADED_FEATURES.include?` (not the one provided by the Array class) for faster feature checks in large codebases (when there are thousands of entries in the features list). I hit this problem while working on [require-hooks](https://github.com/ruby-next/require-hooks#results).

We can use the internal `vm->loaded_features_realpaths` Hash to achieve faster lookups (it's used by MRI's `require / load` mechanism).

Alternatively to overriding the `#include?` method, we can introduce a custom API similar to how `$LOAD_PATH.resolve_feature_path` has been introduced (e.g., `$LOADED_FEATURES.feature_loaded?(path)`); but since the behaviour is similar to `Array#include?`, I'd suggest re-using it (and stay backward compatible).



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