playground: Code refine for args

[breezewish]

What problem does this PR solve?

There are many duplicate codes when introducing new args in TiUP Playground.

What is changed and how it works?

Keep code dry.

This PR is more like a re-implementation of #1365 in another way.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

A simple test about how options looks like now after populateDefaultOpt:

❯ bin/tiup-playground nightly --mode tikv-slim
{"Mode":"tikv-slim","Version":"nightly","PD":{"Num":1},"TiDB":{"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1","Monitor":true}

❯ bin/tiup-playground nightly --mode tidb
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":1,"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1","Monitor":true}

❯ bin/tiup-playground nightly
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":1,"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1","Monitor":true}

❯ bin/tiup-playground nightly --kv 4
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":1,"UpTimeout":60},"TiKV":{"Num":4},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1","Monitor":true}

❯ bin/tiup-playground nightly --kv 4 --db 2
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":2,"UpTimeout":60},"TiKV":{"Num":4},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1","Monitor":true}

❯ bin/tiup-playground nightly --without-monitor
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":1,"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1"}

❯ bin/tiup-playground nightly --without-monitor --mode tikv-slim
{"Mode":"tikv-slim","Version":"nightly","PD":{"Num":1},"TiDB":{"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1"}

❯ bin/tiup-playground nightly --monitor=false
Flag --monitor has been deprecated, Please use --without-monitor to control whether to disable monitor.
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":1,"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1"}

❯ bin/tiup-playground nightly --monitor=true
Flag --monitor has been deprecated, Please use --without-monitor to control whether to disable monitor.
{"Mode":"tidb","Version":"nightly","PD":{"Num":1},"TiDB":{"Num":1,"UpTimeout":60},"TiKV":{"Num":1},"TiFlash":{"Num":1,"UpTimeout":120},"TiCDC":{},"TiKVCDC":{},"Pump":{},"Drainer":{},"Host":"127.0.0.1","Monitor":true}

• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• kaaaaaaang

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[codecov-commenter]

Codecov Report

Patch coverage: 86.36% and project coverage change: +0.18 🎉

Comparison is base (f4dae70) 56.06% compared to head (89a9e72) 56.24%.

❗ Current head 89a9e72 differs from pull request most recent head e760aec. Consider uploading reports for the commit e760aec to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2178      +/-   ##
==========================================
+ Coverage   56.06%   56.24%   +0.18%     
==========================================
  Files         317      317              
  Lines       33578    33454     -124     
==========================================
- Hits        18824    18814      -10     
+ Misses      12504    12396     -108     
+ Partials     2250     2244       -6     

Flag	Coverage Δ
playground	15.45% <86.36%> (+0.07%)	⬆️
tiup	16.01% <ø> (ø)
unittest	22.77% <0.00%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/playground/playground.go	50.72% <0.00%> (+0.22%)	⬆️
components/playground/main.go	60.26% <87.69%> (+11.62%)	⬆️

... and 1 file with indirect coverage changes

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[breezewish]

/merge

[ti-chi-bot]

@breezewish: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to this:

/merge

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[kaaaaaaang]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: e760aec