Cleanup dead code (siglens#2239)

* Remove dead code

* Remove more dead code

* Do more cleanup

* Update documentation

* Revert some changes

* Fix compilation

* Remove unused structs

* Remove proto files

---------

Co-authored-by: Kunal Nawale <knawale@sigscalr.io>

Author: AndrewHess

README.md

@@ -69,7 +69,7 @@ Check out this <a href="https://www.siglens.com/blog/siglens-54x-faster-than-cli
 # Features:
 
 1. Multiple Ingestion formats: Open Telemetry, Elastic, Splunk HEC, Loki
-2. Multiple Query Languages: Splunk SPL, SQL and Loki LogQL
+2. Multiple Query Languages: Splunk SPL, SQL
 3. Simple architecture, easy to get started.