Release 4.21.8

What's Changed

• feat/provided generic types for core typing by @revolist in revolist/revogrid#840
• feat/info-grouping on the rows by @revolist in revolist/revogrid#841
• feat/gh-source by @revolist in revolist/revogrid#842

Full Changelog: revolist/revogrid@v4.21.7...v4.21.8