chore: Clean up unused cmd (#211)

Closes #163. In particular:

- removed `fpd tx` command set but moved `NewWithdrawRewardCmd` and
`NewSetWithdrawAddressCmd` to the root
- removed default value of `--commission-rate` as it is a required flag
- removed rpc `SignMessageFromChainKey` and relevant functionalities
- removed `fpd export-finality-provider`

CHANGELOG.md

@@ -41,6 +41,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 * [#207](https://github.com/babylonlabs-io/finality-provider/pull/207) create finality provider from JSON file
 * [#208](https://github.com/babylonlabs-io/finality-provider/pull/208) Remove sync fp status loop
+* [#211](https://github.com/babylonlabs-io/finality-provider/pull/211) Clean up unused cmd
 
 ## v0.13.1
 

finality-provider/cmd/fpd/daemon/daemon_commands.go

@@ -110,7 +110,7 @@ Where finality-provider.json contains:
 	f.String(sdkflags.FlagHome, fpcfg.DefaultFpdDir, "The application home directory")
 	f.String(chainIDFlag, "", "The identifier of the consumer chain")
 	f.String(passphraseFlag, "", "The pass phrase used to encrypt the keys")
-	f.String(commissionRateFlag, "0.05", "The commission rate for the finality provider, e.g., 0.05")
+	f.String(commissionRateFlag, "", "The commission rate for the finality provider, e.g., 0.05")
 	f.String(monikerFlag, "", "A human-readable name for the finality provider")
 	f.String(identityFlag, "", "An optional identity signature (ex. UPort or Keybase)")
 	f.String(websiteFlag, "", "An optional website link")