Add filter for nextgen image format #777

[Khadreal]

Description

Add imagify_nextgen_images_formats filter

Fixes #777

Type of change

• New feature (non-breaking change which adds functionality).

Is the solution different from the one proposed during the grooming?

No

Checklists

Generic development checklist

• [x] My code follows the style guidelines of this project, with adapted comments and without new warnings.
• [ ] I have added unit and integration tests that prove my fix is effective or that my feature works.
• [x] The CI passes locally with my changes (including unit tests, integration tests, linter).
• [ ] Any dependent changes have been merged and published in downstream modules.
• [ ] If applicable, I have made corresponding changes to the documentation. Provide a link to the documentation.

Test summary

• [ ] I triggered all changed lines of code at least once without new errors/warnings/notices.
• [ ] I validated all Acceptance Criteria of the related issues. (If applicable, provide proof).
• [ ] I validated all test plan the QA Review asked me to.

[jeawhanlee]

@Tabrisrp This PR is dependent on this: https://github.com/wp-media/imagify-plugin/pull/782 no?

[Khadreal]

@Tabrisrp This PR is dependent on this: #782 no?

To the best of my knowledge, no

[Khadreal]

This is how I was picturing it so that we can re-use the function whenever we need:

function imagify_nextgen_images_formats() {
    $formats = [
        'webp',
    ];

    if ( get_imagify_option( 'convert_to_avif' ) ) {
        $formats[] = 'avif';
    }

    $default = $formats;
    /**
     * Filters the array of next gen formats to generate with Imagify
     *
     * @since 2.2
     *
     * @param array $formats Array of image formats
     */
    $formats = apply_filters( 'imagify_nextgen_images_formats', $formats );

    if ( ! is_array( $formats ) ) {
        $formats = $default;
    }

    return $formats;
}

Cool! I was thinking we would use filter in place of calling the function.