Implement Fixed-Size Primitive Layout

Implement read and write of the [Fixed-Size Primitive Layout](https://arrow.apache.org/docs/format/Columnar.html#fixed-size-primitive-layout) and verify against integration tests.

Begin with the linked Apache Arrow Fixed-Size Primitive Layout specification and inspect the existing Erlang layout implementations for their read and write entry points. Use the integration tests mentioned in the issue to verify both operations, with completion defined by passing integration coverage for the fixed-size primitive layout.

Written by the indexing model from the issue text.