Introduce int and float types to trace.proto

[vthacker]

Summary

Part 1 - Introduce int and float types to trace.proto

Kaldb Schema PR breakdown - 5 part series to introduce schema configs to Kaldb

1. introduce a concept of int and float to trace.proto
2. remove the concept of index transformer - it's always trace.span
3. use trace.span to create lucene documents instead of LogMessage
4. insert schema info to trace.proto in the preprocssor
5. leverage schema in the indexer