GeometryType encoding mismatch spec <-> encoder/decoder

[CommanderStorm]

There is a discrepancy between the MapLibre Tile specification and all current reference implementations (C++, Java, Rust, and TypeScript) regarding the encoding of the GeometryType stream.

The spec states:

Byte-RLE

This encoding compresses byte streams, such as the GeometryType stream in Geometry columns. Refer to the ORC specification for implementation details.

Our impl does:

Use Integer RLE instead of Byte-RLE for the GeometryType column

• rust -> rust/mlt-core/src/layer/v01/geometry/decode.rs uses decode_bits_u32(), which eventually calls decode_rle
• java -> java/mlt-core/src/main/java/org/maplibre/mlt/decoder/IntegerDecoder.java uses decodeRLE for integer arrays
• cpp -> cpp/src/mlt/decode/geometry.hpp uses intDecoder.decodeIntStream

So in practice:

• either we do a breaking fix
• remove the currently unused byte-rle