API coverage matrix

[milyin]

Describe the feature

An API coverage matrix should be done for all the languages, bindings. The matrix should highlight what “core” APIs are available in the different bindings. Once the gaps identified, we will decide how to fill those gaps. The API coverage matrix should be made public as part of the documentation

Plan:

• in zenoh automatically generate tag for each API entry
• in other projects sources manually place these tags in comments at corresponding places
• allow to declare additional tags outside of rust sources
• fill the matrix by parsing the sources of all projects

[milyin]

Done in https://github.com/ZettaScaleLabs/api-matrix