feat: add no_std support - #12
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Add std (default) and alloc feature flags. The core cache functionality works in no_std environments using new_static and static_cache!. Dynamic allocation via Cache::new requires the alloc feature. The stats feature now implies alloc since it uses Box and Arc.
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Add
std(default) andallocfeature flags, making the crateno_std-compatible.The core cache functionality works in
no_stdenvironments vianew_staticandstatic_cache!. Dynamic allocation throughCache::newrequires theallocfeature. Thestatsfeature now impliesallocsince it usesBoxandArc.When neither
rapidhashnorstdis enabled, the default hasher type is uninhabited, requiring users to specify their ownBuildHasher.