algolia rules import

When running a command like the following. The existing rules are not cleared.
`algolia rules import my_index --file ~/my_rules.json --clear-existing-rules -y`

Start by reproducing the command shown for the `algolia rules import` entry point and observe whether existing rules remain. Trace that command's handling of `--clear-existing-rules`, then verify that the flag removes existing rules before importing the rules file.

Written by the indexing model from the issue text.