Create a contract for testing HIP-796 HTS precompile extensions

### Problem

We need [at least](https://github.com/hashgraph/hedera-services/blob/hip796-test-dsl/hedera-node/test-clients/src/main/java/com/hedera/services/bdd/suites/hip796/Hip796Verbs.java#L63):
- [ ] `moveBetweenSameUserPartitions(address,address,address,int64)`
- [ ] `moveBetweenDifferentUserPartitions(address,address,address,address,int64)`
- [ ] `createPartition(address,string,string)`
- [ ] `deletePartition(address)`
- [ ] `deletePartition(address,bool,string,bool,string)`
- [ ] `rotateKey((uint256,(bool,address,bytes,bytes,address))`
- [ ] `removeKey(uint256)`

### Solution

Write a contract that implements the above external functions in the obvious way.

### Alternatives

_No response_

Start with the HIP-796 entry point in hedera-node/test-clients/src/main/java/com/hedera/services/bdd/suites/hip796/Hip796Verbs.java, especially the referenced section. Use the listed external function signatures to define the contract's scope; done means all seven checked-off extensions are implemented for the HIP-796 test flow.

Written by the indexing model from the issue text.