Pysubstringsearch

* added support for apple m1 users

- Added `search_multiple` method to search for multiple strings at once
- Updated dependencies
- Linting errors fixes

This is a major release with a complete rewrite in Rust.
Rust offers a safer, sometimes faster and much better code. That is why I chose to replace the previous implementation from C++ to Rust.
In the process I solved many bugs and improved performance by replacing `MSufSort` with `libsais`.
The CI/CD now produces binary wheels allowing faster and simpler installations through pip.
The API remained the same except for one helper function that was added: `add_entries_from_file_lines` that allows to read an input file and interpret its line as entries. This allows to create indices based on file lines much much faster without relying on Python.
Python 3.6 support was dropped and 3.10 was added.

In this release I've done a major overhaul to the implementation and there are some breaking changes.
- Reimplemented the search method to improve performance in small and large datasets.
- There are no more two search functions but only one `search`. It now leverages multiple threads to utilize the system resources.
- Introduced two new count functions to support counting entries/occurrences rather than getting the results.
- New Github actions files

Breaking changes:
`search_sequential` and `search_parallel` were removed in favor of `search`

- updated pybind11 version to support Python 3.9
- updated CI/CD pipeline