fix(config): Move on-disk txpool elements to data folder (#1287)

Fix for @BrickBera 

<img width="261" alt="image"
src="https://github.com/berachain/polaris/assets/93690142/32f43dff-64a6-4569-aa20-715991ac8ea6">


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced a default value for the transaction journal in the legacy
transaction pool if not provided, enhancing the reliability of the
system.
- **Refactor**
- Updated the configuration structure to use the default legacy
transaction pool configuration, improving code readability and
maintainability.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

cosmos/config/config.go

@@ -279,6 +279,15 @@ func readConfigFromAppOptsParser(parser AppOptionsParser) (*Config, error) {
  return nil, err
  }
 
+ if conf.Polar.LegacyTxPool.Journal == "" {
+ conf.Polar.LegacyTxPool.Journal, err =
+ parser.GetString(sdkflags.FlagHome)
+ if err != nil {
+ return nil, err
+ }
+ conf.Polar.LegacyTxPool.Journal += "/data/transactions.rlp"
+ }
+
  if conf.Polar.LegacyTxPool.Rejournal, err =
  parser.GetTimeDuration(flags.ReJournal); err != nil {
  return nil, err

eth/polar/config.go

@@ -51,12 +51,14 @@ func DefaultConfig() *Config {
  gpoConfig.Default = big.NewInt(gpoDefault)
  minerCfg := miner.DefaultConfig
  minerCfg.Etherbase = common.HexToAddress(developmentCoinbase)
- // TODO: setup proper command line flags
+ legacyPool := legacypool.DefaultConfig
+ legacyPool.Journal = ""
+
  return &Config{
  Chain: *params.DefaultChainConfig,
  Miner: minerCfg,
  GPO: gpoConfig,
- LegacyTxPool: legacypool.DefaultConfig,
+ LegacyTxPool: legacyPool,
  RPCGasCap: ethconfig.Defaults.RPCGasCap,
  RPCTxFeeCap: ethconfig.Defaults.RPCTxFeeCap,
  RPCEVMTimeout: ethconfig.Defaults.RPCEVMTimeout,