Add IT framework

[Yury-Fridlyand]

Based on #54/valkey-io#796

This starts redis in standalone mode on port 6380 in CI and a cluster on ports 7000-7006.
To connect to standalone use:

    var client =
        RedisClient.CreateClient(
                RedisClientConfiguration.builder()
                    .address(
                        NodeAddress.builder()
                            .port(TestConfiguration.STANDALONE_PORT)
                            .build())
                    .build())
            .get(10, TimeUnit.SECONDS);

To connect to cluster use:

    var clusterClient =
        ClusterClient.CreateClient(
                RedisClusterClientConfiguration.builder()
                    .address(
                        NodeAddress.builder()
                            .port(TestConfiguration.CLUSTER_PORT)
                            .build())
                    .requestTimeout(3000)
                    .build())
            .get(10, TimeUnit.SECONDS);

NOTE don't use Future::get without specifying a timeout, because it hangs IT/CI on an error!

Test can be started by

./gradlew :integTest:test

The test report is written to

integTest/build/reports/tests/test/index.html

Redis server logs are stored in

<repo root>/utils/clusters

until next test start

To start redis standalone instance IT uses

python3 <repo root>/utils/cluster_manager.py start -p 6380 -r 0

To start redis cluster

python3 <repo root>/utils/cluster_manager.py start --cluster-mode -p 8000 8001 8002 8003 8004 8005

To stop all

python3 <repo root>/utils/cluster_manager.py stop --prefix redis-cluster

[acarbonetto]

Were you planning to add an IT test to show it working?

[Yury-Fridlyand]

On next PR or after rebasing on base commands PR + cluster client PR.
Currently I can't even add IT for basic client.

[Yury-Fridlyand]

Note: Python and Node CI fails on main too, I tested it on this commit: 15d9f4e

[aaron-congo]

Small note on the PR description, it mentions the cluster is available on ports 7000-7006 but in the PR it looks like the cluster is on ports 7000-7005. The example command to start the redis cluster in the PR description also looks like it starts it on 8000-8005 so it should probably be updated to use 7000-7005

[Yury-Fridlyand]

Sharp eyes! Command line listed in PR is an example. It could be helpful for test R&D.