internal/rosa: key-value type

This type is used very frequently. The new type is much easier to type and can receive helper methods eventually if needed.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/dtc.go

@@ -18,7 +18,7 @@ func (t Toolchain) newDTC() (pkg.Artifact, string) {
 		Writable: true,
 		Chmod:    true,
 	}, &MesonHelper{
-		Setup: [][2]string{
+		Setup: []KV{
 			{"Dyaml", "disabled"},
 			{"Dstatic-build", "true"},
 		},