[Repo Command] Add Ability to Add Custom Commit Message When Pushing Spec

Make it slightly easier to start contributing

Fix validator message

Updated links to https

`pod spec create` to use `s.version.to_s` as the git tag when possible

[User Interface] add method to pipe outputs to a pager

[UserInterface] Add output_io attribute to redirect UI output

Fix resource existence check for resources with absolute paths

Updates copy resources script such that it first generates full path and then uses it everywhere.

Adding pod env command to print environment

[TargetInstaller] Ensure installed targets still have unique paths

Fix Swift code completion for Development Pods

[InfoPlistFile] Include UIRequiredDeviceCapabilities for tvOS pods