Add Directory and File state / pipeline args

[kminehart]

• Add specific state getters and setters for each type of argument (String, float, int, file, directory).
• Add support for float, int, file, and directory state values.
• Update the state demo to demonstrate each type of argument.
• Added some rudimentary HTTP functions for using an http client / requests in a pipeline (like for downloading grabpl).
• Added the tarfs package for compressing a fs.FS type into a tar.gz, which is used when handling directories in the state.