Bump version to 0.2.3

[rly]

• Bumped version in various places from 0.2.2 to 0.2.3
• Updated changelog

[Copilot]

Pull Request Overview

This PR bumps the project version from 0.2.2 to 0.2.3 across all relevant configuration files and updates the changelog with release notes for the new version.

• Updated version strings from 0.2.2 to 0.2.3 in all configuration files
• Added changelog entry for version 0.2.3 with release notes
• Minor grammar improvements to existing changelog entries

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/spec/create_extension_spec.py	Updated version string in NWB namespace builder
spec/ndx-franklab-novela.namespace.yaml	Updated version in namespace configuration
pyproject.toml	Updated project version in package configuration
docs/source/conf.py	Updated version and release strings for documentation
CHANGELOG.md	Added new version entry and improved grammar in existing entries

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}