Support higher tx versions in Account

[andrew-fleming]

Fixes #830.

PR Checklist

• Tests
• Documentation
• Added entry to CHANGELOG.md
• Tried the feature on a public network

[ericnordelo]

Looking good andrew! Left a small suggestion.

[ericnordelo]

LGTM!

[andrew-fleming]

Benchmarking gas in query tx version check

The following snippets show the different logic with checking the transaction versions within AccountComponent's __execute__. "Without query version check" does not check if a query version is valid. This means that a user would receive a false positive on a queried transaction if the transaction is not supported by AccountComponent e.g. querying a tx with version 0 would pass; however, executing the transaction would fail.

This PR now proposes to check if the query version is a supported version, but there is a small increase in gas. The table at the bottom of this comment compares the gas estimates from the test runner.

Without query version check:

fn __execute__(...){

    (...)

  // Check tx version
  let tx_info = get_tx_info().unbox();
  let version = tx_info.version;
    if version != TRANSACTION_VERSION {
        assert(version == QUERY_VERSION, Errors::INVALID_TX_VERSION);
    }

    (...)
}

With query version check:

fn __execute__(...){

    (...)

  // Check tx version
  let tx_info = get_tx_info().unbox();
  let tx_version: u256 = tx_info.version.into();
    if (tx_version >= QUERY_OFFSET) {
         assert(QUERY_OFFSET + MIN_TRANSACTION_VERSION <= tx_version, Errors::INVALID_TX_VERSION);
    } else {
        assert(MIN_TRANSACTION_VERSION <= tx_version, Errors::INVALID_TX_VERSION);
  }

    (...)

}

Account __execute__ tests	Without check	With check	Diff	Diff %
test_execute	1491640	1500620	8980	.60%
test_execute_invalid_version	847910	856890	-	1.05%
test_execute_future_version	1491740	1500720	-	.60%
test_execute_query_version	1491640	1500620	-	.60%
test_execute_future_query_version	1491740	1500720	-	.60%
test_multicall	2078650	2087630	-	.43%
test_multicall_zero_calls	385430	394410	-	2.33%

[martriay]

That's very low, and it will get proportionally smaller the bigger is the Array<Call>. Let's add the check.