Allow Replayer to report the results of TraceRecords. (facebook#8657)

Summary:
`Replayer::Execute()` can directly returns the result (e.g, request latency, DB::Get() return code, returned value, etc.)
`Replayer::Replay()` reports the results via a callback function.

New interface:
`TraceRecordResult` in "rocksdb/trace_record_result.h".

`DBTest2.TraceAndReplay` and `DBTest2.TraceAndManualReplay` are updated accordingly.

Pull Request resolved: facebook#8657

Reviewed By: ajkr

Differential Revision: D30290216

Pulled By: autopear

fbshipit-source-id: 3c8d4e6b180ec743de1a9d9dcaee86064c74f0d6

CMakeLists.txt

@@ -819,6 +819,7 @@ set(SOURCES
         trace_replay/block_cache_tracer.cc
         trace_replay/io_tracer.cc
         trace_replay/trace_record_handler.cc
+        trace_replay/trace_record_result.cc
         trace_replay/trace_record.cc
         trace_replay/trace_replay.cc
         util/coding.cc

HISTORY.md

@@ -22,7 +22,7 @@
 * The integrated BlobDB implementation now supports the tickers `BLOB_DB_BLOB_FILE_BYTES_READ`, `BLOB_DB_GC_NUM_KEYS_RELOCATED`, and `BLOB_DB_GC_BYTES_RELOCATED`, as well as the histograms `BLOB_DB_COMPRESSION_MICROS` and `BLOB_DB_DECOMPRESSION_MICROS`.
 
 ## Public API change
-* Added APIs to decode and replay trace file via Replayer class. Added `DB::NewDefaultReplayer()` to create a default Replayer instance. Added `TraceReader::Reset()` to restart reading a trace file. Created trace_record.h and utilities/replayer.h files to access decoded Trace records and replay them.
+* Added APIs to decode and replay trace file via Replayer class. Added `DB::NewDefaultReplayer()` to create a default Replayer instance. Added `TraceReader::Reset()` to restart reading a trace file. Created trace_record.h, trace_record_result.h and utilities/replayer.h files to access the decoded Trace records, replay them, and query the actual operation results.
 
 ### Performance Improvements
 * Try to avoid updating DBOptions if `SetDBOptions()` does not change any option value.

TARGETS

@@ -337,6 +337,7 @@ cpp_library(
         "trace_replay/io_tracer.cc",
         "trace_replay/trace_record.cc",
         "trace_replay/trace_record_handler.cc",
+        "trace_replay/trace_record_result.cc",
         "trace_replay/trace_replay.cc",
         "util/build_version.cc",
         "util/coding.cc",
@@ -655,6 +656,7 @@ cpp_library(
         "trace_replay/io_tracer.cc",
         "trace_replay/trace_record.cc",
         "trace_replay/trace_record_handler.cc",
+        "trace_replay/trace_record_result.cc",
         "trace_replay/trace_replay.cc",
         "util/build_version.cc",
         "util/coding.cc",