Add version flag to launcher

[R1kaB3rN]

Adds a version flag to launcher and prints the release version of the CLI as well as its associated tooling that are defined in the TOML config file -- ULWGL_VERSIONS.toml.

Example of ULWGL_VERSIONS.toml:

# Required. We expect this table
[ulwgl.versions]
# Required. We expect this key
launcher = "1.0"
# All other key value pairs can be anything and we just print them all
reaper = "1.0" 
pressure_vessel = "1.0"
runtime = "sniper"

NOTE: This file needs to be included in the release.

For the config. we check the current directory for the file and /usr/share/ULWGL. In case of absence, nothing will be printed.

As a result, versions for our tools are centralized and we avoid hard coding version names in scripts. In addition, the version config files can be autogenerated via a Github Action

[GloriousEggroll]

lgtm just leaving open in case toml handling changes due to #37

Feel free to merge once that's resolved.