YT-21233: Introduce ToAttributeValue cpo which removes dependency of TErrorAttribute from yt/core

Plan:

 1) Remove `IAttributedDictionary` type from the public API. \+

 2) Remove `Set` method from public API in favor of `operator<<=`. \+

 3) Adopt `ConvertTo<T>` (or other name) CPO with proper extension into `NYT::NYson::ConvertTo` from `yt/core`.

 4) Use CPO from (3) to eliminate direct dependency on `yt/core` of `Get/Find` methods from attributes API.

 5) Adopt `ConvertToYsonString` (or other name) CPO with proper extension into `yt/core` customisations.

 6) Use CPO from (5) to eliminate direct dependency on `yt/core` of `TErrorAttribute` ctor.

 7) Swap attributes implementation to the one which doesn’t use `IAttributeDictionary`.

 8) At this point `stripped_error*` can be moved to library/cpp/yt and so can recursively dependant on THROW macro methods `Get/Find/…`.

 9) Adjust CPO’s to work with `std::string` instead of `TYsonString` assuming text format to be used (maybe `TString` for now).

10) Remove dep of `library/cpp/yt/error` on `yson` entirely.

This pr addresses 5-6 steps of plan. Below is a brief explanation of design decisions. We also expressed everything related to key-value code in terms of aliases of `TErrorAttribute` so that later we could make a relatively simple switch to `std::string`. We expect to do steps 7-8 in the next pull request as everything should be ready
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