Create integration tests

[fgimenez]

We can start with local clusters using the current tooling for testing on CI.

For every pull request we should create a local deployment. When we tag a new release we should also deploy on remote using a minimal deployment (first create the config file, it should be composed of 3 nodes running on aws, gcp and azure with monitoring enabled).

For the local deployment we should check that blocks are being produced and finalized (see https://github.com/w3f/polkadot-deployer/blob/master/lib/benchmarks/strategies/finality.js) for how we do this on benchmarks.

For the remote deployment we should check block production, finalization and also the monitoring endpoints (grafana and substrate-telemetry).