C++ wpi::MakeStructArraySchema creates an incorrect schema

[bhall-ctre]

Instead of creating an array of the target schema type, wpi::MakeStructArraySchema (and by extension wpi::Struct<std::array<T, N>>::GetSchema()) instead copies the schema from the target type and makes the last field an array.

For example, consider the struct definition for a std::array<frc::Pose2d, 2>. The expected schema should look something like:

Pose2d values[2]

However, the generated schema is instead:

Translation2d translation;Rotation2d rotation[2]

which is not equivalent to our desired array.

Because an identifier is required in a struct schema, I believe wpi::MakeStructArraySchema should take a std::string_view ident, and the Struct template specialization should as a result be wpi::Struct<std::array<T, N>, std::string_view, I...>.