Implement SQL server for Doublets

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It should be possible to insert, update and delete links via SQL mutations.
Furthermore, it should be also possible to search links using any of existing links' IDs, or just get a complete list of links from links storage.
All SQL standard types and user defined (custom) tables creation should be supported as well.

Server, parser and planer part can be implemented using [calcite.apache.org](https://calcite.apache.org) (or any other library/framework with similar number of features).

Access to doublets can be implemented via Java to C# bridge (https://github.com/jni4net/jni4net/ or https://www.javonet.com/pricing/). If that is not possible, Doublets can be accessed via [Gql Server](https://github.com/linksplatform/Data.Doublets.Gql).

All features of SQL standard should be supported to be executed on the virtual links table and custom tables.

[calcite.apache.org](https://calcite.apache.org) is not the only solution that can be used.

The goal is to create a fully featured SQL interface (server + library) to Doublets and custom virtual tables using any language and a set of libraries/tools.

Start by evaluating the required server, parser, planner, and links-storage behavior against Apache Calcite and the suggested Gql Server or Java-to-C# bridge. Done means supporting SQL mutations, link searches and listing, standard types, custom tables, and the stated SQL features through both the server and library.

Written by the indexing model from the issue text.