This PR introduces a simulation framework designed to test the server by simulating multiple clients performing various
actions over several rounds. The framework reads simulation configurations from YAML files, validates them against a
predefined schema, and executes the simulation accordingly.

Here's a summary of the key changes made:

1. **New `simulation` Module**:
   - Added a new Go module `simulation` with its own `go.mod` and `go.sum`.
   - Introduced a main application for running simulations based on a YAML configuration.
   - Included functions for setting up clients, performing actions like onboarding, sending transactions, and claiming funds.
   - Added validation of simulation configuration against a schema using `gojsonschema`.

2. **Simulation Configuration**:
   - Added `simulation1.yaml` as an example configuration file for running simulations.
   - Defined a `schema.yaml` for validating simulation configurations.

3. **`.gitignore` Updates**:
   - Added `.idea` to ignore IntelliJ IDEA project files.

4. **`Dockerfile` Update**:
   - Updated the base image version of Golang from `1.23.1` to `1.23.2`.

5. **`go.work` Update**:
   - Updated the Go version from `1.23.1` to `1.23.2`.
   - Added a new directory `./simulation` to the workspace.

6. **`go.work.sum` Update**:
   - Added new dependencies `github.com/coreos/go-systemd` and `github.com/go-task/slim-sprig`.

7. **`e2e_test.go` Modifications**:
   - Removed the `setupAspWallet` function and replaced its usage with `utils.SetupAspWalletCovenantless`.

8. **`test_utils.go` Modifications**:
   - Added a new function `SetupAspWalletCovenantless` to handle wallet setup with optional initial funding.

* rework nonces encoding

* add a check in Musig2Nonce decode function

* musig2_test: increase number of signers to 20

* musig2.json: add a test case with a 35 leaves tree