Register polling metadata only for polled endpoints

[jlabedo]

Description

Every endpoint has some default PollingMetadata registered in the container even if it is not a polled endpoint.
This PR registers PollingMetadata only for polled endpoints.
On a medium sized Symfony repository, I get a 10% speedup on cache:clear.

Type of change

• Performance

[dgafka]

InboundChannelAdapterBuilder can be set up for cron execution, and continues polling is meant for fixed rate.

However I believe we could simplify this code a bit here, as it's called only for Async Endpoints.
Therefore if we would add fixed rate as a default if PollingMetadata was not passed, then potentially we could remove withContinuousPolling config completely.
Can you check that?

[jlabedo]

Do you mean something like this ?

    // packages/Ecotone/src/Messaging/Config/Container/MessagingContainerBuilder.php
    private function getPollingConfigurationForPolledEndpoint(string $endpointId): PollingMetadata
    {
        if (array_key_exists($endpointId, $this->pollingMetadata)) {
            $pollingMetadata = $this->pollingMetadata[$endpointId];
        } else {
            $pollingMetadata = PollingMetadata::create($endpointId)
                ->setFixedRateInMilliseconds(1);
        }

Tests are failing in this case (for e.g. test_serializing_command_and_event_before_sending_to_asynchronous_channel)

[dgafka]

Yea I meant something like that.
But maybe in that case, this should be as part of PollingMetadata::create as default configuration if not changed.

[dgafka]

I've not checked if that's possible, so 🍏.
If we can do it then cool, if not we just continue on the logic we had :)