YAML schema error on new intrinsics function Fn::ForEach

Hi team,

With the new intrinsic function released, `Fn::ForEach`, I realize that it's not supported by the schema. I use `AWS ToolKit` for schema support for features like autocomplete. Everything else works great except when I try to use the new intrinsics, it looks quite nasty.

Would it be possible to support `Fn::ForEach` in the intrinsics.json schema file?

Best

Start with the intrinsics.json schema file and inspect how existing intrinsic functions are defined. Add support for Fn::ForEach, then verify that the schema recognizes the intrinsic for validation and autocomplete in CloudFormation templates.

Written by the indexing model from the issue text.