This is an example of usage of the WordPress Quicktags API, quicktags_settings filter and wp_editor function. This is not a ready-to-use plugin

text-editor.php

<?php
/**
 * Add scripts to admin page footer
 *
 * @since 2.8.0
 *
 */
function my_quicktags() {

	if ( wp_script_is( 'quicktags' ) ) {
	?>
	<script type="text/javascript">
	QTags.addButton( 'eg_php', 'PHP', '<pre><code class=\"language-php\">', '</code></pre>', 'p', 'PHP Code', 200 );
	QTags.addButton( 'eg_css', 'CSS', '<pre><code class=\"language-css\">', '</code></pre>', 'q', 'CSS Code', 201 );
	QTags.addButton( 'eg_html', 'HTML', '<pre><code class=\"language-html\">', '</code></pre>', 'r', 'HTML Code', 202 );
	QTags.addButton( 'eg_callback', 'CSS div', css_callback );

	function css_callback(){
		var css_class = prompt( 'Class name:', '' );

		if ( css_class && css_class !== '' ) {
	        QTags.insertContent('<div class="' + css_class +'"></div>');
	    }
	}
	</script>
	<?php
	}

}
add_action( 'admin_print_footer_scripts', 'my_quicktags' );

/**
 * Filters the Quicktags settings.
 *
 * @since 3.3.0
 *
 * @param array  $qtInit    Quicktags settings.
 * @param string $editor_id The unique editor ID, e.g. 'content'.
 */
function my_quicktags_2( $qtInit, $editor_id = 'content' ) {
	$qtInit['buttons'] = 'strong,em,link,block,del,ins,img,ul,ol,li,code,more,close';
	return $qtInit;
}
add_filter( 'quicktags_settings', 'my_quicktags_2', 10, 2 );