[CARBONDATA-2929][DataMap] Add block skipped info for explain command

[kevinjmh]

This pr will add block skipped info by counting distinct file path from hit blocklet. It shows like below:

|== CarbonData Profiler ==
Table Scan on test
 - total: 125 blocks, 250 blocklets
 - filter: (l_partkey <> null and l_partkey = 1006)
 - pruned by Main DataMap
    - skipped: 119 blocks, 238 blocklets
 - pruned by CG DataMap
    - name: dm
    - provider: bloomfilter
    - skipped: 6 blocks, 12 blocklets

|== CarbonData Profiler ==
Table Scan on test
 - total: 125 blocks, 250 blocklets
 - filter: TEXT_MATCH('l_shipmode:AIR')
 - pruned by Main DataMap
    - skipped: 0 blocks, 0 blocklets
 - pruned by FG DataMap
    - name: dm
    - provider: lucene
    - skipped: 12 blocks, 80 blocklets

Be sure to do all of the following checklist to help us incorporate
your contribution quickly and easily:

• Any interfaces changed?

• Any backward compatibility impacted?

• Document update required?

• Testing done
  Please provide details on
  - Whether new unit test cases have been added or why no new tests are required?
  - How it is tested? Please attach test report.
  - Is it a performance related change? Please attach the performance test report.
  - Any additional information to help reviewers in testing this change.

• For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.

[CarbonDataQA]

Build Success with Spark 2.1.0, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder2.1/243/

[CarbonDataQA]

Build Failed with Spark 2.2.1, Please check CI http://95.216.28.178:8080/job/ApacheCarbonPRBuilder1/412/

[CarbonDataQA]

Build Failed with Spark 2.3.1, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder2.3/8482/

[jackylk]

LGTM. Thanks for your contribution

[CarbonDataQA]

Build Success with Spark 2.1.0, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder2.1/249/

[CarbonDataQA]

Build Success with Spark 2.3.1, Please check CI http://136.243.101.176:8080/job/ApacheCarbonPRBuilder2.3/8487/

[CarbonDataQA]

Build Failed with Spark 2.2.1, Please check CI http://95.216.28.178:8080/job/ApacheCarbonPRBuilder1/417/

[xuchuanyin]

I think the message can be optimized from
- total: 125 blocks, 250 blocklets
to
- total: 125 blocks containing 250 blocklets