perf: Optimize writeIntegerList - #917
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Signed-off-by: ldintr <levo.d@swirldslabs.com>
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Replaces the two-pass (compute size, then write) approach with single-pass type-specific writers that reserve placeholder space for the length prefix and patch it in afterward, falling back to two-pass only for very large lists. Output bytes unchanged.
Overview: PbjReader/PbjWriter are a leaner, buffer-reusing alternative to the existing ReadableSequentialData/WritableSequentialData read/write path used by Codec, ProtoParserTools/ProtoWriterTools, and the pbj-compiler generators. They reuse an internal ~16KB (L1-cache-sized) buffer across many parse/write calls instead of allocating per call, avoid checked-exception-based control flow by recording a sticky internal error code instead, and split hot-path operations (e.g. zigzag vs. non-zigzag varints, direct UTF-8 decode into a reusable char[]) into dedicated fast methods.