Upgrade guide from v2 to v3

bun i @kilnfi/sdk@latest

const k = new Kiln({
  testnet: true,
  apiToken: 'kiln_xxx',
});

const vault: Integration = {
  provider: 'fireblocks',
  fireblocksApiKey: 'YOUR_API_USER_KEY', // your fireblocks API user key
  fireblocksSecretKey: apiSecret, // your fireblocks private key (generated with your CSR file and your API user)
  vaultId: 7 // your fireblocks vault id
};

...
const tx = await k.near.craftStakeTx(
      'account_id',
      'wallet',
      'pool_id',
      0.1,
    );
const txSigned = await k.near.sign(vault, tx);

const k = new Kiln({
  baseUrl: 'https://api.testnet.kiln.fi',
  apiToken: 'kiln_xxx',
});

const vault: Integration = {
  provider: 'fireblocks',
  fireblocksApiKey: 'YOUR_API_USER_KEY', // your fireblocks API user key
  fireblocksSecretKey: apiSecret, // your fireblocks private key (generated with your CSR file and your API user)
  vaultId: 7 // your fireblocks vault id
};

const tx = await k.client.POST(
      '/v1/near/transaction/stake',
      {
        body: {
          account_id: 'account_id',
          wallet: 'wallet',
          pool_id: 'pool_id',
          amount_yocto: '1000000000000000000000000',
        }
      }
    );

const signResponse = await k.fireblocks.signNearTx(vault, tx.data.data, "NEAR_TEST");

const broadcastedTx = await k.client.POST("/v1/near/transaction/broadcast", {
      body: {
        signed_tx_serialized: signResponse.signed_tx.data.signed_tx_serialized,
      }
    });