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feat(builtin): complete bitstring accessors for Array/FixedArray/Bytes/ReadOnlyArray (#3743)

Only `ArrayView[Byte]` and `BytesView` had the full bitstring accessor set.
Add the missing forwarders so `Array[Byte]`, `FixedArray[Byte]`, `Bytes`, and
`ReadOnlyArray[Byte]` each expose all 27 methods (13 core extractors + 14
byte-aligned fastpaths):

- `Array[Byte]` / `FixedArray[Byte]` / `Bytes`: add the 6 signed core
  extractors (bit_signed, byte_signed, int_le/be, int64_le/be) and all 14
  aligned fastpaths, forwarding through `bs[:]`.
- `ReadOnlyArray[Byte]`: new section with all 27 methods, forwarding through
  `unsafe_reinterpret_to_fixed_array()` to the `FixedArray[Byte]` API.

Existing forwarders were already simple one-liners and are unchanged.

Add a cross-check test suite that validates every accessor on all four types
against the `BytesView` reference over identical data, including the aligned
fastpaths and bytesview sub-extraction.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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