Summary

Port BSON support from ZIO Schema v1 to ZIO Schema 2 in a new top-level schema-bson project.

Implementation includes:

• BsonBinaryCodec abstract class extending BinaryCodec[A]
• BsonFormat object with Deriver[BsonBinaryCodec]
• Support for all 30 primitive types (Unit, Boolean, Byte, Short, Int, Long, Float, Double, Char, String, BigInt, BigDecimal, all java.time types, Currency, UUID)
• Record, variant, sequence, map, dynamic value, and wrapper support
• Recursive type support via lazy initialization
• Comprehensive test suite with 135 tests

Deriver Methods Implemented:

• derivePrimitive - All primitive types
• deriveRecord - Case classes encoded as BSON documents
• deriveVariant - Sealed traits with discriminator field
• deriveSequence - Collections encoded as BSON arrays
• deriveMap - Maps encoded as BSON documents (string keys) or arrays (non-string keys)
• deriveDynamic - DynamicValue support
• deriveWrapper - Wrapper types with validation

Dependencies:

• org.mongodb:bson:5.2.0

Test plan

• All 135 tests pass
• Format check passes
• Compiles against latest main

/claim #683