Improve TGenericLocalValue, allow mixed thread-fiber-etc values

Make generic local values more safe and usable:

- instead of factory, register fiber/coroutine-aware "GLS (general local storage) contexts";
- put up to 4 (normally no more than 2 -- threads and one coroutine implementation) different "tls" variables into one generic, choose correct one from current execution context;
- suitable version of variable will be constructed on demand (no dependency from first usage);
- improve unit test too.
commit_hash:8586846a6a775bd66dffcdf58263f78042be2480

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