## Description

Some examples of functions that are and are not entry functions, to be
used as part of Sui docs.

This PR also introduces a new home for sui-move examples (i.e. to port
examples from `sui_programmability`).

## Test Plan

```
sui$ cargo build --bin sui
sui$ ~/sui/target/debug/sui move build -p ~/sui/examples/sui-move/entry_function
sui-framework-test$ cargo nextest run
```