feat(bautajs-core): update tap behaviour to make it consistent

[Xavier-Redondo]

Pull Request Template

PR Checklist

• I have run npm test locally and all tests are passing.
• I have added/updated tests for any new behavior.
• I have added/updated documentation for any new behavior.
• If this is a significant change, an issue has already been created where the problem / solution was discussed: [N/A, or add link to issue here]

PR Description

This implements issue #138.

Basically implements tap in a consistent manner following the expected definition of the function tap function common in other languages/frameworks.

The detail of this definitioin is explained in the documentation of the pr itself, but a very brief defintion is this:

Given a set of step functions inside tap, the end result of tap is:

- either an exception if there was an exception while processing them
- the value received by the first step function inside tap decorator as its result

The end purpose of tap is allow side effects without losing the value used in the previous step function.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Manifest Files

[franher]

LGTM