feat: add mapache-py library

[BK1031]

• Adds mapache-py, a Python port of the mapache-go telemetry library
• Ports all domain models as dataclasses: Signal, Vehicle, Session, Marker, Segment, Ping
• Ports full binary encoding/decoding suite (big/little endian, signed/unsigned)
• Ports Message/Field system with pluggable ExportSignalFunc for custom signal scaling
• 131 tests ported 1:1 from Go test cases, all passing
• mypy --strict and ruff clean
• CI workflows (lint, typecheck, test matrix 3.10-3.14) and PyPI publish workflow matching ulid-py patterns

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