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feat(hashmap): add get_from_bytes / get_from_string to match Map API

`builtin/Map` already supports zero-allocation lookups with a `BytesView` /
`StringView` key (`Map::get_from_bytes`, `Map::get_from_string`). The
unordered `@hashmap.HashMap` had no such pair, so callers had to materialize
an owned `Bytes` / `String` to probe a hash map with view-shaped keys.

This adds the two mirror methods on `HashMap`, with the same probing logic
as `Map`. The cross-type equality helpers used here
(`BytesView::equal_to_bytes`, `StringView::equal_to_string`) come from
the preceding refactor in `builtin`, so no helpers are duplicated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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