Add FaultDetectionStats to collect latency and failure metrics

[amathur1893]

The changes are made in accordance of how we are getting fault detection metrics from ES. Fault Detection metrics in ES will be published in a manner similar to ingest metrics. Hence changing collector and processor accordingly.
Fixes #:

1. Tested using Docker
   Tmp file

^fault_detection
{"current_time":1615283839364}
{"FollowerCheck_Latency":1.28,"LeaderCheck_Latency":1.8,"FollowerCheck_Failure":3.0,"LeaderCheck_Failure":4.0}$

Table created

sqlite> .tables
FollowerCheck_Latency     
FollowerCheck_Failure
LeaderCheck_Latency     
LeaderCheck_Failure

Contents of the table

sqlite> select * from LeaderCheck_Latency;
1.8|1.8|1.8|1.8
sqlite> select * from FollowerCheck_Latency;
1.28|1.28|1.28|1.28
sqlite> select * from LeaderCheck_Failure;
4.0|4.0|4.0|4.0
sqlite> select * from FollowerCheck_Failure;
3.0|3.0|3.0|3.0

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