Feature/from chars rvv - #2
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The BOOST_UUID_USE_RISCV_V config macro is automatically defined when the compiler defines __riscv_v, indicating RISC-V Vector Extension (V 1.0+) support is available. The macro is also added to the BOOST_UUID_NO_SIMD exclusion list.
This adds a RISC-V Vector (RVV) implementation of the from_chars algorithm, ported from the x86 SIMD implementation. The RVV version supports VLEN >= 128 and handles narrow and wide character types (char, char16_t, char32_t). The implementation follows the same structure as from_chars_x86.hpp: deinterleaving of input character pairs, dash validation, hex character validation, and nibble packing. It uses two separate expected dash vectors (one per character pair) instead of x86's single shuffled vector, as RVV's vrgather-based deinterleaving makes this approach more natural. The generic fallback path is preserved: both the x86 and RISC-V SIMD paths dispatch to from_chars_generic when std::is_constant_evaluated() is true.
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