feat: command to convert peers.txt into addrbook.json (#2623)

Closes #2619

## Description

Adds a new command to celestia-appd called `addrbook`.

```
./build/celestia-appd addrbook --help

Convert a list of peers into an address book.
The first argument (peers.txt) should contain a new line separated list of peers. The format for a peer is `id@ip:port` or `id@domain:port`.
The second argument (addrbook.json) should be the output filename. The address book is saved to the output file in JSON format.

Usage:
  celestia-appd addrbook peers.txt addrbook.json [flags]
```

## Testing

I was able to run a node on arabica-10 with an `addrbook.json` that was
created from
[arabica-10/peers.txt](https://github.com/celestiaorg/networks/blob/master/arabica-10/peers.txt).
Note, testing failed on mocha-4 due to
celestiaorg/networks#349

cmd/celestia-appd/cmd/addrbook.go

@@ -0,0 +1,55 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/celestiaorg/celestia-app/app"
+	"github.com/spf13/cobra"
+	"github.com/tendermint/tendermint/p2p"
+	"github.com/tendermint/tendermint/p2p/pex"
+)
+
+func addrbookCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "addrbook peers.txt addrbook.json",
+		Short: "Convert a list of peers into an address book",
+		Long: "Convert a list of peers into an address book.\n" +
+			"The first argument (peers.txt) should contain a new line separated list of peers. The format for a peer is `id@ip:port` or `id@domain:port`.\n" +
+			"The second argument (addrbook.json) should contain the complete file path, including both the directory path and the desired output file name, in the following format: `path/to/filename`. The address book is saved to the output file in JSON format.\n",
+		Args: cobra.ExactArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			inputFile := args[0]
+			outputFile := args[1]
+
+			data, err := os.ReadFile(inputFile)
+			if err != nil {
+				return err
+			}
+			lines := strings.Split(string(data), "\n")
+
+			routabilityStrict := app.DefaultConsensusConfig().P2P.AddrBookStrict
+			book := pex.NewAddrBook(outputFile, routabilityStrict)
+			for _, line := range lines {
+				if line == "" {
+					continue
+				}
+				address, err := p2p.NewNetAddressString(line)
+				if err != nil {
+					return err
+				}
+				err = book.AddAddress(address, address)
+				if err != nil {
+					return err
+				}
+			}
+
+			book.Save()
+			fmt.Printf("Converted %s into %s\n", inputFile, outputFile)
+			return nil
+		},
+	}
+
+	return cmd
+}

cmd/celestia-appd/cmd/root.go

@@ -135,6 +135,7 @@ func initRootCmd(rootCmd *cobra.Command, encodingConfig encoding.Config) {
 		debugCmd,
 		config.Cmd(),
 		commands.CompactGoLevelDBCmd,
+		addrbookCommand(),
 	)
 
 	server.AddCommands(rootCmd, app.DefaultNodeHome, NewAppServer, createAppAndExport, addModuleInitFlags)