feat: dnf4 module

[certifiedfoolio]

This dnf4 module will allow people to work with images with slower, more stable release cycles. An example is CentOS Stream. Based on @fiftydinar's dnf5 module, this dnf4 module contains changes to syntax of dnf found in dnf.nu in order to work with dnf4. There are also two bash scripts that turn the outputs of two dnf4 commands into parseable json, as dnf4 does not have the --json flag.

[certifiedfoolio]

There is an error in the nushell code I cannot resolve (I have 0 experience in nushell), so this module can't be used to add repositories rn.

[certifiedfoolio]

As for how this is going to get implemented, if at all, we can keep this as an entirely separate module, or merge the changes into the dnf5 module, and add a detector for dnf4 to change the syntax accordingly.

[certifiedfoolio]

@fiftydinar @xynydev Ready for review!