CJS type declarations are not exported

When dual-publishing libraries, CJS and MJS bundles must have different .d.ts files. Currently there is only type declaration file, which is for the MJS bundle.

Checked with:

https://publint.dev/linq-functional@1.0.1
https://arethetypeswrong.github.io/?p=linq-functional%401.0.1

koppa96 / linq-functional

CJS type declarations are not exported #6