To add a new native Move function

1. Add a new ./sui-framework/{name}.move file or find an appropriate .move.
2. Add the signature of the function you are adding in {name}.move.
3. Add the rust implementation of the function under ./sui-framework/src/natives with name {name}.rs.
4. Link the move interface with the native function in all_natives
5. Write some tests in {name}_tests.move and pass run_framework_move_unit_tests.
6. Optionally, update the mock move VM value in gas_tests.rs since the sui-framework package will increase the gas metering.
7. Optionally, run cargo insta test and cargo insta review since the sui-framework build will change the empty genesis config.

Note: The gas metering for native functions is currently a WIP; use a dummy value for now and please open an issue with move label.