YQL-19747 Enable custom NameSet and FrequencyData

Clients might want to use custom `NameSet` and `FrequencyData` in their environment, for example, to get their private UDFs and to have more relevant ranking that includes their private UDF and respect their usage pattern.

To achieve this goal I decided to load pure `NameSet` and `FrequencyData` and provide functions for pruning. Also I checked defaults and decided that it is more common for a client to create a `StaticNameService` from pure `NameSet` and `FrequencyData` to keep their pruning consistent.

I also extracted a separate module `ranking`. It will be needed when I will implement `UnionNameService` to union `StaticNameService` and `SchemaNameService`. `UnionNameService` will load `Limit` names from each child and then crop them to sorted prefix of length `Limit` using `IRanking`.

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- Related to `YQL-19747`
- Related to https://github.com/ydb-platform/ydb/issues/9056
- Related to https://github.com/vityaman/ydb/issues/14

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Pull Request resolved: https://github.com/ytsaurus/ytsaurus/pull/1246

Co-authored-by: vvvv <vvvv@yandex-team.com>
Co-authored-by: vvvv <vvvv@yandex-team.com>
commit_hash:cdca301a58a34e56d537a447b4ff779cd70faea6

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