crypto: add keyring supported algorithms (#439)

* add keyring supported algorithms

* lint

* minor updates

* use eth_secp256k1 as the default signing algo

* add flag

* derivation func

* refactor

* rename keys amino registration

* fix keys

* address comments from review

docs/quickstart/run_node.md

@@ -47,7 +47,7 @@ ethermintd start
 To run a node with the same key every time: replace `ethermintcli keys add $KEY` in `./init.sh` with:
 
 ```bash
-echo "your mnemonic here" | ethermintcli keys add $KEY --recover
+echo "your mnemonic here" | ethermintcli keys add $KEY --recover --algo "eth_secp256k1"
 ```
 
 ::: tip Ethermint currently only supports 24 word mnemonics.
@@ -56,7 +56,7 @@ echo "your mnemonic here" | ethermintcli keys add $KEY --recover
 You can generate a new key/mnemonic with:
 
 ```bash
-ethermintcli keys add $KEY
+ethermintcli keys add $KEY --algo "eth_secp256k1"
 ```
 
 To export your ethermint key as an ethereum private key (for use with Metamask for example):

docs/quickstart/testnet.md

@@ -57,7 +57,7 @@ minimum-gas-prices = ""
 
 ```bash
 # Create a key to hold your account
-ethermintcli keys add $KEY
+ethermintcli keys add $KEY --algo "eth_secp256k1"
 
 # Add that key into the genesis.app_state.accounts array in the genesis file
 # NOTE: this command lets you set the number of coins. Make sure this account has some coins
@@ -268,7 +268,7 @@ Now that accounts exists, you may create new accounts and send those accounts
 funds!
 
 ::: tip
-**Note**: Each node's seed is located at `./build/nodeN/ethermintcli/key_seed.json` and can be restored to the CLI using the `ethermintcli keys add --restore` command
+**Note**: Each node's seed is located at `./build/nodeN/ethermintcli/key_seed.json` and can be restored to the CLI using the `ethermintcli keys add --restore --algo "eth_secp256k1"` command
 :::
 
 ### Special Binaries