* Create `plugins.New` function, updating existing code to use it
* Add another test for `hook.Run` function
* Enable `plugin_add_command.bats` tests for Go implementation of asdf
* Add `RunCallback` method to `Plugin` struct
* Update `plugins.Add` function to run `post-plugin-add` plugin callback script
* Handle Bash expression and scripts properly in `execute` package so `$@` is always set
* Create `pluginindex.Build` function
* Use `pluginindex` when no plugin URL provided for plugin add command
* Get more `plugin_add_command` BATS tests passing against Golang version
* Only use `pluginindex` when it is not disabled
* Update error message so it matches legacy format
* Add staticcheck.conf
* Move plugins/git package to /git.
* Update repoer interface in pluginindex package to match interface in git package
* Use git package's Repo struct in pluginindex package
* Simplify BATS test Golang code
* Update plugin add test to new command format
* Correctly set `ASDF_DATA_DIR` for BATS tests
* Rename `PluginAdd` function to `Add`
* Create `plugin.Remove` function
* Make plugin remove command invoke `plugin.Remove` function
* remove underscores from function names (addresses warnings from revive linter)
* create installMockPluginRepo function
* implement plugin list command
* Add go-git as a dependency
* Remove plugins dir from gitignore
* Move config code to config package
* Create validatePluginName function
* Create PluginDirectory function
* Create PluginExists function
* Implement PluginAdd function
* Add testify as a dependency
* Write test for PluginAdd happy path
