Show diagnostics and redirect them to stderr

[NRHelmi]

This PR aims to edit the way we show diagnostics to mimic the console way as described in the ticket below
https://relationalai.atlassian.net/browse/RAI-6706

Output example:

$> go run examples/execute/main.go --engine "test-engine" --database "test-db" -c "def output:x = 1
def output:y = fooo
def output:z = bar
def output:w = 2
"
{
    "id": "39397365-b592-1854-d784-79532b980dc0",
    "state": "COMPLETED"
}

// "output", "x", int64
output, x, 1

// "output", "w", int64
output, w, 2

Problems:
error: UNDEFINED, `fooo` is undefined. (2, 16)
2| def output:y = fooo
                  ^^^^

error: UNDEFINED, `bar` is undefined. (3, 16)
3| def output:z = bar
                  ^^^

Diagnositcs: errors: 2, exceptions: 0, warnings: 0