Searching logs by different criterias

This MR adds option to search by different criteries like:

• service names
• NOT service names
• severity numbers
• NOT severity numbers
• trace IDs
• NOT traceIDs
• spanIDs
• fingerprints
• traceFlags
• NOT traceFlags
• body
• log attributes
• resource attributes
• exact time of the event

Due to schema limitations, we do not support ATM searching by:

• NOT span IDs and NOT fingerprints - in theory we could workaround it using projections, but not sure there is a use case that would justify the extra work and storage space
• NOT body - this is a hard limitation explained here
• NOT log attributes and NOT resource attributes - hard limitation of the bloom filters

Resolves #2738 (closed) and backend part of #2676 (closed)