Add uint8_t support to bit-oriented APIs

[wangxiao1254]

Summary

Add first-class uint8_t byte-bool buffers to the bit-oriented APIs that previously accepted only bool*.

This removes type-punning at call sites while preserving the existing packed representation, PRG consumption, and zero-length behavior.

Changes

• add uint8_t overloads for bools_to_bits and bits_to_bools;
• add byte-bool output to PRG::random_bool using the same implementation and block schedule as bool output;
• add byte-bool IOChannel::send_bool / recv_bool with the same packed wire format;
• accept byte selectors in F2K inner products and GaloisFieldPacking;
• update benchmarks to pass byte storage through typed APIs instead of casting it to bool*;
• document the input/output convention: zero is false, nonzero is true, and produced byte-bools are normalized to 0 or 1.

Compatibility

The existing bool* APIs remain unchanged. The constrained byte overloads also preserve unambiguous null, zero-length calls.

Wire bytes are identical between bool and uint8_t representations.

Tests

• clean Apple Clang 17 Release/Ninja build: 88/88 build steps;
• full CTest suite: 52/52 passed;
• focused test_block, test_f2k, test_prg, and test_netio: 4/4 passed.

Coverage includes boundary lengths and tail preservation, null zero-length calls, nonzero byte inputs, normalized output, PRG position/following-block parity, F2K selector parity, and cross-representation NetIO transfers.

Stack

This is PR 1 of 6 and targets main.