* Replace direct `fmt.Println()` usage in a test with `t.Log()`
* Rename `cmd` to `cli`
* Move asdf command from module root
* Fix some linter warnings, thus enabling some tests that were being skipped
* Fix `Makefile`
* Rename module to `github.com/asdf-vm/asdf`
* Fix `TestGetAllToolsAndVersionsInContent/returns_empty_list_with_found_true_and_no_error_when_empty_content`
* Rewrite `Unique()` to be a bit more straightforwards
* Get workflow checks passing again
toolversions.Unique is ever so slightly faster, technically.
```
goos: linux
goarch: amd64
pkg: github.com/asdf-vm/asdf/internal/toolversions
cpu: AMD Ryzen 9 3900X 12-Core Processor
│ /tmp/old.txt │ /tmp/new.txt │
│ sec/op │ sec/op vs base │
Unique-24 346.5n ± 1% 342.4n ± 1% -1.17% (p=0.027 n=10)
│ /tmp/old.txt │ /tmp/new.txt │
│ B/op │ B/op vs base │
Unique-24 160.0 ± 0% 160.0 ± 0% ~ (p=1.000 n=10) ¹
¹ all samples are equal
│ /tmp/old.txt │ /tmp/new.txt │
│ allocs/op │ allocs/op vs base │
Unique-24 3.000 ± 0% 3.000 ± 0% ~ (p=1.000 n=10) ¹
¹ all samples are equal
```
* Create asdf-version script to print formatted version
* Update Makefile to set main.version variable during build
* Improve help output formatting
* Update release-build workflow to set asdf version in binaries
* Switch to non-verbose test output in Makefile
* Create pluginindex package with PluginIndex struct with methods for updating index and retrieving plugin URLs
* Create IndexRepo interface to allow for easy testing out cloning real Git repository.
