Implements the Fleet side of #14899
- Add new endpoints to update and retrieve yara rules
- Add support in fleetctl for applying the rules
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [x] Changes file added for user-visible changes in `changes/`, `orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/Committing-Changes.md#changes-files) for more information.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL injection is prevented (using placeholders for values in statements)
- [ ] Added support on fleet's osquery simulator `cmd/osquery-perf` for new osquery data ingestion features.
- [x] Added/updated tests
- [ ] If paths of existing endpoints are modified without backwards compatibility, checked the frontend/CLI for any necessary changes
- [x] If database migrations are included, checked table schema to confirm autoupdate
- For database migrations:
- [x] Checked schema for all modified table for columns that will auto-update timestamps during migration.
- [ ] Confirmed that updating the timestamps is acceptable, and will not cause unwanted side effects.
- [x] Ensured the correct collation is explicitly set for character columns (`COLLATE utf8mb4_unicode_ci`).
- [x] Manual QA for all new/changed functionality
