Temporary disable string queries for L0

[akroviakov]

Addresses #379.
Detect string related queries and fall back to CPU from L0, extend memory level handling for L0.

• Select.FilterShortCircuit - runs on L0
• Select.InValues - runs on L0
• Select.ComplexQueries - fallback to CPU (on string-related queries)
• Select.Case - fallback to CPU (on string-related queries) / PerfectJoinHashTable is not functional for L0
• Select.Strings - fallback to CPU
• Select.SharedDictionary - fallback to CPU
• Select.StringCompare - fallback to CPU
• Select.DictionaryStringEquality - explicitly disallows CPU retry

[kurapov-peter]

Thanks!