RFE: API/Feature Coverage Comparison Table

[bryceschober]

I would be helpful to have a rough comparison table that would be maintained to help set our expectations with regard to feature and/or API coverage across the several APIs. Perhaps especially in the C/C++ language options, it's not straightforward to find the differences between the base zenoh-rs implementation and the zenoh-c wrapper vs. the zenoh-pico implementation, and how those might "feed forward" into the zenoh-cpp interface(s).

Some form of this table would be especially helpful to include links to relevant API doc sections, corresponding tests, or roadmap items.