[clarity] Setup Standard Clarinet Project For PoX-4 Flow Tests

[setzeus]

Describe the bug
In the previous sBTC-Mini work we had a clarinet project structure inside the repository that allowed us to build out a useful testing suite for testing PoX-4.

Before we can move forward on PoX-4 work in this repo, it's critical we can stand-up our Clarity/Clarinet/TypeScript test suite.

The success case for this issue would be a pseudo-port / minified-version of the setup previously found here: https://github.com/Trust-Machines/stacks-sbtc/tree/main/sbtc-mini

[setzeus]

Discussed in #3948 , currently blocked by repo testing considerations (adding Clarinet).

[setzeus]

No updates here or #3948 as we figure out how to best work with new repos

[friedger]

clarinet testing exists now in contrib/core-contract-tests

[friedger]

First implementation: #4100
Documentation still missing.

[friedger]

We are using clarunit now by Marvin #4203 (comment)

[blockstack-devops]

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