Fix panic on send tx

[uri-lightblocks]

How to recreate

prepare and send a transaction with the wrong chainID

Motivation

This fixes a panic

2024-03-05T19:45:30.775Z        DEBUG   logging/zap_logger.go:45        Estimating gas and nonce
2024-03-05T19:45:30.952Z        DEBUG   logging/zap_logger.go:45        Getting signer for tx
2024-03-05T19:45:30.952Z        DEBUG   logging/zap_logger.go:45        Sending transaction
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x65cda4]

goroutine 1 [running]:
github.com/ethereum/go-ethereum/core/types.(*Transaction).Hash(0x2a4?)
        /root/go/pkg/mod/github.com/ethereum/go-ethereum@v1.13.14/core/types/transaction.go:464 +0x24
github.com/Layr-Labs/eigensdk-go/chainio/clients/wallet.(*privateKeyWallet).SendTransaction(0x4000427900, {0xc0dc08, 0x109f7e0}, 0x0?)
        /root/go/pkg/mod/github.com/!layr-!labs/eigensdk-go@v0.1.2-0.20240305012634-36a80cc83d6e/chainio/clients/wallet/privatekey_wallet.go:84 +0x52c
github.com/Layr-Labs/eigensdk-go/chainio/txmgr.(*SimpleTxManager).Send(0x4000527888, {0xc0dc08, 0x109f7e0}, 0x4000248570?)
        /root/go/pkg/mod/github.com/!layr-!labs/eigensdk-go@v0.1.2-0.20240305012634-36a80cc83d6e/chainio/txmgr/txmgr.go:68 +0x38
...

Solution

print the hash of the input transaction
(EXTRA *errors.errorString=send: tx 0xaa2ed977c171484f812f37baac53b3fc10358f3d9ba10b958b4ca0983c0aaaea failed.: invalid chain id for signer)

[samlaf]

Thanks Uri :)