feat: convert entire CLI to clibase (#6491)

I'm sorry.

cli/help.tpl

@@ -0,0 +1,55 @@
+{{- /* Heavily inspired by the Go toolchain formatting. */ -}}
+Usage: {{.FullUsage}}
+
+
+{{ with .Short }}
+{{- wrapTTY . }}
+{{"\n"}}
+{{- end}}
+
+{{ with .Aliases }}
+{{ "\n" }}
+{{ "Aliases:"}} {{ joinStrings .}}
+{{ "\n" }}
+{{- end }}
+
+{{- with .Long}}
+{{- formatLong . }}
+{{ "\n" }}
+{{- end }}
+{{ with visibleChildren . }}
+{{- range $index, $child := . }}
+{{- if eq $index 0 }}
+{{ prettyHeader "Subcommands"}}
+{{- end }}
+    {{- "\n" }}
+    {{- formatSubcommand . | trimNewline }}
+{{- end }}
+{{- "\n" }}
+{{- end }}
+{{- range $index, $group := optionGroups . }}
+{{ with $group.Name }} {{- print $group.Name " Options" | prettyHeader }} {{ else -}} {{ prettyHeader "Options"}}{{- end -}}
+{{- with $group.Description }}
+{{ formatGroupDescription . }}
+{{- else }}
+{{- end }}
+    {{- range $index, $option := $group.Options }}
+	{{- if not (eq $option.FlagShorthand "") }}{{- print "\n  -" $option.FlagShorthand ", " -}}
+	{{- else }}{{- print "\n      " -}}
+	{{- end }}
+    {{- with flagName $option }}--{{ . }}{{ end }} {{- with typeHelper $option }} {{ . }}{{ end }}
+    {{- with envName $option }}, ${{ . }}{{ end }}
+    {{- with $option.Default }} (default: {{ . }}){{ end }}
+        {{- with $option.Description }}
+            {{- $desc := $option.Description }}
+{{ indent $desc 10 }}
+{{- if isDeprecated $option }} DEPRECATED {{ end }}
+        {{- end -}}
+    {{- end }}
+{{- end }}
+---
+{{- if .Parent }}
+Run `coder --help` for a list of global options.
+{{- else }}
+Report bugs and request features at https://github.com/coder/coder/issues/new
+{{- end }}