CRAN release: v5.4.0

• feat: migrate holidays() function to Nager.Date API and add support for ISO country codes #61
• feat: mp3_get() prioritizes iTunes Search API for metadata extraction with Spotify as a fallback
• feat: new mp3_update_tags() function to update MP3 metadata tags using eyeD3
• fix: high-quality audio trimming (V0) and file handling in mp3_trim()
• feat: new cal_split() function to split dates into multiple columns (year, month, week, day, etc)
• feat: new parameter model_name in h2o_automl() and h2o_results() for cleaner, more intuitive API
• feat: added model_name parameter to enable custom model naming for better file organization with export_results()
• feat: new toon_reduction() to calculate size reduction of JSON vs TOON format
• feat: new click parameter on dont_sleep() to disable mouse clicks while keeping screen awake
• fix: resolved scoping issue in h2o_results() that caused object 'model_name_input' not found error
• fix: improved mplot_metrics() robustness to handle missing validation metrics without crashing
• fix: parameter dir passed correctly in get_creds() and allows full YAML file path
• docs: added minimum version requirement fansi (>= 1.0.0) in DESCRIPTION for colored output support
• docs: created comprehensive new vignettes for API integrations, Data Wrangling, Games, Machine Learning, and Robyn
• docs: fixed some links avoiding crawlers in README.md and documentation
• recode: split other_functions.R into utils_data.R, utils_system.R, and utils_text.R for better maintainability
• recode: renamed get_mp3() and trim_mp3() to mp3_get() and mp3_trim() for consistency