Enhance field indexing and schema management, and update README and c…

[soderlind]

This pull request includes several updates aimed at enhancing the WP Loupe plugin's functionality, improving field indexing, and refining the schema manager. The key changes include the introduction of a new filter for field modification, updates to the version number, and additional safeguards in the initialization process.

Enhancements and Improvements:

• Enhanced field indexing to strictly respect settings configuration, improved schema manager to only include explicitly selected fields, and refined factory class to ensure proper field filtering from settings. Added a new filter wp_loupe_field_{$field_name} to allow field modification (CHANGELOG.md, README.md, includes/class-wp-loupe-indexer.php) [1] [2] [3] [4].

Version Updates:

• Updated the version number from 0.2.2 to 0.2.3 in composer.json, package.json, readme.txt, and wp-loupe.php to reflect the new release (composer.json, package.json, readme.txt, wp-loupe.php) [1] [2] [3] [4].

Initialization Safeguards:

• Added additional checks in the init function to prevent running setup during autosave, WP CLI, and AJAX requests (wp-loupe.php).

Documentation Updates:

• Updated README.md and readme.txt to document the new filter and changes in field indexing behavior (README.md, readme.txt) [1] [2].

Codebase Adjustments:

• Moved the init call after register_hooks in the __construct method of WP_Loupe_Indexer to ensure hooks are registered before initialization (includes/class-wp-loupe-indexer.php).

PR Overview

This PR enhances the WP Loupe plugin's functionality with improvements to field indexing, schema management, and documentation updates.

• Introduces a new filter to allow dynamic field modification.
• Updates version numbers across multiple files to reflect the new release.
• Adds safeguards in the initialization process to prevent unintended execution during autosave, WP CLI, and AJAX requests.

Reviewed Changes

File	Description
README.md	Updated to document the new dynamic filter wp_loupe_field_{$field_name}.
CHANGELOG.md	Added changelog entries for the enhancements and version bump.

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