Integration tests for cosmos-sdk App & CosmWasm Rollup

[Bidon15]

Introduction 🧐

As @smuu will be taking charge of https://github.com/celestiaorg/devops/issues/129,
this is a breakdown of initial work that we need to do.

Ideas to start with 📝

It will be beneficial if we can check that a running rollup can have the same functionality as the L1 version of it, such as:

### Tasks
- [ ] Simple TXs (send, multi-send)
- [ ] Staking
- [ ] Queries IP:Ports of the node (grpc/rpc/rest/etc.)

Implementation

We can use this https://github.com/celestiaorg/devops/issues/291 when the first iteration of the framework comes out
We should fork https://github.com/cosmos/cosmos-sdk/tree/main/systemtests and make it a standard rollup framework:

• Run DA + Node

Then we can perform tests on the node.

• Ideally this epic should cover tests that are executed on every PR
• Tests should be short-lived
• using local-devnet docker image makes sense as a base assumption that DA is operable

[julienrbrt]

I can extend #81 eventually to make a tx and query it

[julienrbrt]

Partly implemented in #87.
We can either wait for cosmwasm tests until we fork system tests or split the current workflow and init a cosmwasm chain.