Added FNIRS functionalities

Author: Ramdam17

CHANGELOG.md

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+# Changelog
+
+## [0.5.0b10] - 2025-07-10
+
+### Added
+- Proper package inclusion for fnirs, shiny, wavelet, xdf modules
+- Fixed Poetry configuration for PyPI publishing
+
+### Fixed
+- Resolved Poetry build issues with sub-packages
+- Fixed missing modules in published package
+
+### Changed
+- Updated pyproject.toml configuration
+- Migrated to proper PEP 621 format