lextool: remove unimplemented firehose validator

Will add this to 'goat' instead

atproto/lexicon/cmd/lextool/main.go

@@ -33,11 +33,6 @@ func main() {
 			Usage:  "fetch from network, validate against catalog",
 			Action: runValidateRecord,
 		},
-		&cli.Command{
-			Name:   "validate-firehose",
-			Usage:  "subscribe to a firehose, validate every known record against catalog",
-			Action: runValidateFirehose,
-		},
 		&cli.Command{
 			Name:   "resolve",
 			Usage:  "resolves an NSID to a lexicon schema",

atproto/lexicon/cmd/lextool/net.go

@@ -78,18 +78,3 @@ func runValidateRecord(cctx *cli.Context) error {
 	fmt.Println("success!")
 	return nil
 }
-
-func runValidateFirehose(cctx *cli.Context) error {
-	p := cctx.Args().First()
-	if p == "" {
-		return fmt.Errorf("need to provide directory path as an argument")
-	}
-
-	cat := lexicon.NewBaseCatalog()
-	err := cat.LoadDirectory(p)
-	if err != nil {
-		return err
-	}
-
-	return fmt.Errorf("UNIMPLEMENTED")
-}