Support installation via ASDF

[OldhamMade]

It would be useful for developers working with systems that use KeyDB if KeyDB could be installed via ASDF. ASDF allows developers to manage multiple runtime versions of a tool, which can be very useful if multiple projects use the same service but with different versions. It is also a very simple tool to use that hides a lot of the complexity of installing services.

While KeyDB is currently available via a number of different package managers, ASDF can keep setups nicely sandboxed: it creates a .tool-versions file in the local directory, and running asdf install in that directory will install all the required services for a project and set the correct local version. That means it's a great way to manage the runtime dependencies for a project. For example, one can specify the exact versions of Python, NodeJS, Postgres, Redis, and ElasticSearch a project needs to run locally and install them all with a single command. Adding KeyDB to ASDF would help improve the installation process.