avro

AVRO-4004: [Rust] Ignore logicalType fields when creating the canonical form (#2976)

* AVRO-4004: [Rust] Ignore logicalType fields when creating the canonical form

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

* AVRO-4004: [Rust] Ignore the namespace for non-named schemas

When creating the canonical parsing form of a Schema ignore the
namespace for any non-named Schemas, i.e. anything but Record, Enum,
Fixed and Ref

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

* AVRO-4004 Remove the test for round trip after canonical form

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

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Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>