Enable ssz serialization and add WalletClient tests

[ukorvl]

This diff fixes lots of minor issue in ssz serialization enabling it work properly. It introduces valid ssz schemas accordingly with ssz schemas in the main repository.
It improves methods signatures making user's life much more easier. To send the message user should specify its fields. We added auto-fill for such message fields as gasPrice, gasLimit, from, value, data.
For instance, to send a common message we can use sendMessage we can specify only:

client.sendMessage({
    to: addHexPrefix(defaultAddress),
    value: 0n,
});

To deploy a contract there is a method deployContract. We can call it like this:

client.deployContract({
    deployData: {
      bytecode: "0x",
    },
});

All other parameters are auto-filled, but can be overwritten by the user.

[changeset-bot]

🦋 Changeset detected

Latest commit: a2f1700

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@nilfoundation/niljs	Patch

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