Feature: correlation method after mommertz

[ahms5]

Which issue(s) are closed by this pull request?

Closes #12

Changes proposed in this pull request:

• introduce correlation method after mommertz, in other words, calcualte scattering coefficient from freefield measurements depending on the incident direciton

requires #32

[Copilot]

Pull Request Overview

This PR introduces a new correlation method to calculate the scattering coefficient from free-field measurements based on the Mommertz method. Key changes include:

• Implementation of the correlation_method in imkar/scattering/freefield.py.
• Addition of comprehensive tests for the new method in tests/test_scattering_freefield.py.
• Updates to module exports and documentation to include the new scattering functionality.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_scattering_freefield.py	New tests validating the correlation_method behavior and type checks.
imkar/scattering/freefield.py	Implementation of the new correlation_method following Mommertz.
imkar/scattering/init.py	Updated module export for scattering functions.
imkar/init.py	Updated package initialization to include the scattering module.
docs/modules/imkar.scattering.freefield.rst	Documentation update for the new free-field scattering method.
docs/api_reference.rst	Reference documentation updated to feature the new module.