token: ditch the generic bundle in favor of specialized struct

It's kust cleaner that way, the generic has no upside.

token/delegation/delegationtest/generator/generator.go

@@ -217,7 +217,6 @@ func (g *generator) writeGoFile() error {
 	Println("import (")
 	Println("\t\"github.com/ipfs/go-cid\"")
 	Println()
-	Println("\t\"github.com/ucan-wg/go-ucan/token\"")
 	Println("\t\"github.com/ucan-wg/go-ucan/token/delegation\"")
 	Println(")")
 
@@ -243,7 +242,7 @@ func (g *generator) writeGoFile() error {
 	Println("}")
 
 	Println()
-	Println("var AllBundles = []token.Bundle[*delegation.Token]{")
+	Println("var AllBundles = []delegation.Bundle{")
 	for _, d := range g.dlgs {
 		Printf("\t%sBundle,\n", d.name)
 	}