Integration tests (#312)

* Add docker compose for running integration tests.
Runs entry_node and arbitrary number of peers in docker network

* Fix permission denied in container if run without mounting a `rw` volume making it possible to run as throw-away container.
Remove `VOLUME` from Dockerfile as this only pollutes host system with anonymous volumes.

* Use named network for easier external use

* Add test container that discovers peers and waits for autopeering to happen

* Fix min waitForNeighbors

* Add go.sum

* Run integration tests with Github Actions

* Added framework that abstracts the docker network and provides convenience functionality

* Update directory in Github Actions

* Add bash script for automated local test execution

* Add getMessageByHash endpoint

* Adjust to merge changes

* Add methods to easily do HTTP POST requests

* Added relay message test

* Increase client timeout

* Verbose output for tests makes it easier to follow the execution

* Introduce small API wrapper for GoShimmer HTTP API

* Adjust relay test to use new API wrapper

* WIP: Docker logs

* Fix issue with serving visualizer analysis server of entry node

* Persist logs of containers after CI run

* Fix test file

* Fix uploading of artifacts

* Save all containers' logs as artifacts

* Create logs files also with local run

* Add possibility to retrieve logs from a peer via Docker logs

* Make tester part of the goshimmer module to make code sharing possible

* Use client/lib to make HTTP requests in tester

* Fix unit test directory

* Add comments/doc to the code

* Add readme

* Move tester to own module and don't build container but use existing golang one instead

* Address PR comments

* Adjust to merge

* Only use 1 config file for all containers

* go mod tidy

* Rename client lib base url