E2E tests for sidecars

[mojtaba-esk]

While working on celestia-node e2e tests, found out there are some limitations in using sidecars. For example, it failed to read a file from an obsy sidecar. Not sure if there was an issue with knuu or with that particular sidecar or its configs. Therefore, having a comprehensive e2e tests that tests the required functions on a sidecar seems necessary. The tests can include, but not limited to: Execute a command in a sidecar, read a file from a running sidecar, ...

Currently there is only reading logs from a sidecar and of course tests for the knuu modules, which are developed as sidecars. e,g: NetShaper, TShark,...