uber / h3-go / 27662644333

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feat: add pure-Go measures (cell area, distance, averages) to x/h3go

Port the measures cluster to pure Go: CellAreaRads2/Km2/M2 (Cagnoli
signed-area sum over the cell boundary with Kahan compensated summation),
GreatCircleDistanceRads/Km/M (haversine), and the per-resolution average
helpers HexagonAreaAvgKm2/M2 and HexagonEdgeLengthAvgKm/M.

Verified against the cgo reference via paritytest. Cross-implementation
area parity uses a relative tolerance: Go's math and C's libm differ by a
few ULPs in the transcendental functions, which grows to ~1e-6 relative at
the finest resolution.

EdgeLengthRads/Km/M are deferred to the directed-edge phase, which they
depend on.

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

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