Setup community edition

[Nao-ris]

There are two editions of Couchbase Lite C: enterprise and community.
In Doctolib we only use the enterprise version, but in order to release this crate on crates.io it would be beneficial to offer both options. This is the goal of this pull request.

The main changes of this pull request are:

1. Two new features in Cargo.toml: enterprise & community. Exactly one must be selected or the compilation will fail in build.rs.
2. All the functionalities that are not available in the community edition (encryption & peer-to-peer) are hidden behind the enterpise feature.
3. Instead of the libcblite folder containing the enterprise lib files, there are now two folders: libcblite_enterprise & libcblite_community.
4. The file build.rs is modified in order to link with the right folder depending on the specified edition.
5. The script update_cblite_c.sh is enhanced to run the whole process for both editions.

Some smaller changes are also added:

1. A custom pre-commit hook is added to check that both editions build.
2. The GH workflow rust is split in two worflows: build & test.
3. The three workflows build, test & clippy now use matrixes to check both editions.
4. The c_playground is modified with the new path of the enterprise lib files.