CLI command 'tx evm send' creates Cosmos transactions instead of Ethereum transactions

## Bug Report
### Summary
The `evmd tx evm send` CLI command is incorrectly implemented and creates regular Cosmos `MsgSend` transactions instead of Ethereum `MsgEthereumTx` transactions. This causes confusion for users who expect EVM transactions when using the EVM module's send command.

### Expected Behavior
When using `evmd tx evm send [from] [to] [amount]`, the command should:

- Create a `MsgEthereumTx` transaction that executes on the EVM
- Show up in EVM block explorers
- Work with third party's expecting Ethereum transactions
- Behave like a native Ethereum transfer

### Actual Behavior
The command currently:

- Creates a regular Cosmos `MsgSend` transaction
- Only shows up in Cosmos explorers, not EVM explorers
- Doesn't work with third party services expecting Ethereum transactions
- Transfers tokens on the Cosmos side instead of EVM side

### Steps to Reproduce

1. Set up a local Cosmos EVM chain using `evmd`
2. Run: `evmd tx evm send [from_address] [to_address] [amount] --fees [fee] --gas [gas_limit]`
3. Check the transaction in both Cosmos and EVM explorers
4. Observe that the transaction only appears in the Cosmos explorer

### Code Analysis
The issue is in `x/vm/client/cli/tx.go` in the `NewSendTxCmd` function:
https://github.com/cosmos/evm/blob/main/x/vm/client/cli/tx.go#L173
```go
//This creates a Cosmos MsgSend instead of MsgEthereumTx
msg := types2.NewMsgSend(clientCtx.GetFromAddress(), toAddr, coins)
```

### Proposed Solution
The `NewSendTxCmd` function should create a `MsgEthereumTx` instead of `MsgSend`. The implementation should:

- Create an Ethereum transaction using `EvmTxArgs`
- Use `NewTx()` to create a `MsgEthereumTx`
- Handle gas estimation properly for EVM transactions
- Maintain compatibility with both hex and bech32 addresses

Start in x/vm/client/cli/tx.go at NewSendTxCmd and reproduce the command with the listed evmd arguments. Read the EvmTxArgs and NewTx usage described in the issue, then verify that the command produces a MsgEthereumTx, handles gas and both address formats, and appears in EVM rather than only Cosmos explorers.

Written by the indexing model from the issue text.