Add sign transaction card

[Hugoo]

[Esanim]

https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_signtransaction

The card should have inputs for

• gas limit, gas price, nonce, chainId, value, data, from, to.

The extension will return signed transaction string.

Additionaly, there could be a button that when pressed, executes that transaction (no extension involvement, just sending raw signed tx)

[JeneaVranceanu]

SignTransaction component is already added. It's missing gasLimit, gasPrice, nonce, chainId, maxFeePerGas, maxPriorityFeePerGas fields. Located at src/components/endpoints/SignTransaction.vue.