Diagnostics for long running analytics queries

[SloNN]

Analytical queries (OLAP) can take a long time to execute and need a lot of information to diagnose.

For diagnostics it is necessary to receive:

• query text
• metadata of tables that participated in queries
• query execution plan
• AST
• ...

All this data can already be collected through ydb cli using --explain --diagnostics-file diagnostics command, it would be great to get this data through YDB UI as a single file (?) that can be passed (emailed) to YDB for diagnostics.

One would probably want to expand the amount of information we collect over time