Filters :: Supporting multiple events

[Valazan]

Currently we are not supporting multiple events with direct encoding as suggested in #774

Modify the current thor.logs.filterEventLogs to support the feature

Events will be filtered in both these ways, by either using a fragment or the contract object:

await thor.logs.filterEventLogs(
    criteriaSet: [
        {
            address: '0x0000000000000000000000000000456e65726779',
            fragment: 'event Transfer(address indexed from, address indexed to, uint256 amount)',
            args: ['0xd8da6bf26964af9d7eed9e03e53415d37aa96045', '0xa5cc3c03994db5b0d9a5eedd10cabab0813678ac']
        }
    ]
})

Could also be invoked like this:

await thor.logs.filterEventLogs(
    criteriaSet: [
        contract.criteria.Transfer('0xd8da6bf26964af9d7eed9e03e53415d37aa96045', '0xa5cc3c03994db5b0d9a5eedd10cabab0813678ac')
    ]
})

[nwbrettski]

Duplicate of #774