Add changefeed summary in list command, add some shortcut

[amyangfei]

What problem does this PR solve?

Fix item-12 in pingcap/ticdc#542

What is changed and how it works?

• Add a summary filed in changefeed list
• Accepts a shorthand letter for some variable name, including c is short for changefeed-id, p is short for `capture-id

Sample output

➜  ./cdc cli changefeed list
[
  {
    "id": "4e24dde6-53c1-40b6-badf-63620e4940dc",
    "summary": {
      "state": "normal",
      "tso": 417886179132964865,
      "checkpoint": "2020-07-07 16:07:44.881",
      "error": null
    }
  },
  {
    "id": "8f0bd661-e3ab-4e25-a8eb-d835c0348a58",
    "summary": {
      "state": "stopped",
      "tso": 417885338318929921,
      "checkpoint": "2020-07-07 15:14:17.430",
      "error": null
    }
  }
]

Check List

Tests

• Unit test
• Integration test

Related changes

• Need to update the documentation

Release note

• No release note

[amyangfei]

/run-integration-tests

[overvenus]

LGTM

[zier-one]

LGTM

[amyangfei]

/run-integration-tests

[codecov-commenter]

Codecov Report

Merging #721 into master will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master       #721   +/-   ##
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  Coverage   34.3884%   34.3884%           
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  Files            91         91           
  Lines          9762       9762           
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  Hits           3357       3357           
  Misses         6103       6103           
  Partials        302        302