Add additional eth_getBlockByNumber acceptance tests

[Nana-EC]

Problem

The initial eth_getBlockByNumber coverage was scarce

Solution

Add move coverage

• Enhance the already existing getBlockByNumber test by adding assertion of the returned object that it has transactions array containing the full transaction and not only the string of their hash (testing the "hydrated transactions flag")
• Add a test that queries existing block by number but sets hydrated transactions to **false**. Assert that the response contains transactions` array but the values are strings of the transaction hash
• Add negative test for non-existing block number with hydrated transactions set to **true**. The response of the call must be asserted to be:

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": null
}

• Add negative test for non-existing block number with hydrated transactions set to **false**. The response of the call must be asserted to be:

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": null
}

Alternatives

No response