Support new tokens event indexing using events service

[James-Mart]

Tested the event system using the following query, which works:

// To: https://events.psibase.127.0.0.1.sslip.io:8080/sql
SELECT * FROM "history.tokens.transferred" where receiver="alice" ORDER BY ROWID

[
    {
        "tokenId": "1",
        "time": {
            "seconds": 1715629976
        },
        "sender": "symbol",
        "receiver": "alice",
        "amount": {
            "value": "100000000000"
        },
        "memo": "memo"
    }
]