YT-21233: Introduce TErrorAttributes as an opaque type for attributes to hide dependencies on IAttributeDictionary's API

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 pull request covers steps 1 and 2 laying foundation to 3-4 being implemented in the next one
commit_hash:e899bccdef4ebed321ea2eb93215282694c261ac

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