Switch to pkgx and pkgx-dev

[shah]

Now that pkgx and pkgx-dev are in GA, switch from ASDF, eget, etc. to pure pkgx and pkgx dev. So, our home-polyglot should long-term really just be any Linux distro, chezmoi, and pkgx at its core and pkgx-dev for development environments.

[rinshadka]

@shah, we have now replaced asdf with pkgx at udi-service and making use of eget and rtx along side. In the case of pkgx-dev, what I understood is that - we can prepare and activate development environment with generally available opensource tools automatically using pkgx pantry, but cannot be used for handling our custom build binaries - discussion link.

For activating pkgx dev in home-polyglot, currently it is lacking support for integrating with fish shell and the team in working on this. Reference - pkgxdev/pkgx#838

Thanks.