**Motivation**
Adds a bash script that allows one to launch up a local kurtosis testnet
based off of the changes made locally.
Might be useful to others -- if so, I can clean it up
<!-- Why is this PR exists? What are the goals of the pull request? -->
**Description**
```
# start a testnet with local changes
./scripts/kurtosis/run.sh start
# stop the testnet and cleanup
./scripts/kurtosis/run.sh stop
```
---------
Co-authored-by: Nico Flaig <nflaig@protonmail.com>