feat: configure record length in yaml config

[adrienaury]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces a configurable record length in the YAML configuration and updates associated APIs and tests to work with the new buffer reset signature. Key changes include:

• Updating the Buffer.Reset method to accept a record length parameter.
• Propagating predicate API changes to return errors.
• Adding a new YAML field "Length" in configuration and adjusting error messages in commands.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/posimap/import_test.go	Updated test to pass an explicit length (0) when resetting the buffer.
pkg/posimap/core/schema/schema_test.go	Modified buffer reset calls to use a configured record length (125).
pkg/posimap/core/record/object.go	Enhanced export method by propagating errors from predicate evaluations.
pkg/posimap/core/predicate/predicate.go	Changed predicate functions to return (bool, error) for more robust error handling.
pkg/posimap/core/buffer/buffer.go	Refactored Reset and Required methods to use growTo with a configurable size parameter.
pkg/posimap/api/predicate.go	Updated the predicate type to include error handling in its signature.
internal/appli/config/model.go	Added a new Length field to allow record length configuration via YAML.
internal/appli/command/unfold.go	Modified command logic to use the new configurable record length when resetting the buffer.
internal/appli/command/fold.go	Adjusted buffer reset and error handling to use the configurable record length.