Add Cocoapods Support

[cpisciotta]

Would it be possible to support Cocoapods again? It looks like the podspec file was removed at some point. It'd be really helpful to add this back, as the project I'm working on cannot use SPM at this time.

[dmytro-anokhin]

Removing Cocoapods support reduces amount of support work. It does require some workarounds to make the package work in a way I structured it. Unfortunately number of unique views from cocoapods.org is very small (about 1%), so I don't plan to reintegrate it.