2.15.0

Various fixes & improvements

• feat: Implement new chunk based upload for standalone artifact bundles (#1490)
• feat: Inject sourcemap debug ids by default when performing sourcemaps upload and print injection report (#1513)
• ref: Use recursive walk instead of globbing when looking for sourcemaps inject files (#1504)
• ref: When injecting sourcemap debug ids, make sure that sourceMappingURL comment is always kept at the end of a file (#1511)