[Step 2/4] Queue Time Histgram (#6467)

# Description
Add two main class for queue time histogram lambda:
- TimeIntervalGenerator: generate list of time intervals based on the
latest timestamp from source table and target table
- generate a single data from source table if no timestamp found in
target table
   - throw error if the interval is greater than maxi-interval threshold
- WorkerPoolProcessor:
- input the interval list from TimeIntervalGenerator, and process
histogram data in parrallel
- It process each interval by calling the QueueTimeProcessor.process(),
and in the end write all result to destination
# Others
- added unit tests for all utilization methods
- clickhouse_client is not thread-safe, make sure each thread has its
own client in thread pool

# Next steps
step 3
  - Add HistogramGenerator
  - Add runner_label logic in HistogramGenerator
  - Fix the issue with GithubConfigRetriever
  - Change the target db to misc. instead of fortesting
step 4
   - setup AWS resources 
   - setup deployment

Author: yangw-dev