tiup & playground: Tidy output

[breezewish]

What problem does this PR solve?

Make output more cleaner for tiup and playground.

What is changed and how it works?

Before:

After:

Also introduced a new utility colorstr, which can be used to print colors easier.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release notes:

NONE

[codecov-commenter]

Codecov Report

Attention: 59 lines in your changes are missing coverage. Please review.

Comparison is base (ced2d6d) 47.65% compared to head (0f1239d) 49.17%.

❗ Current head 0f1239d differs from pull request most recent head 2885ac4. Consider uploading reports for the commit 2885ac4 to get more accurate results

Files	Patch %	Lines
pkg/exec/run.go	7.69%	36 Missing ⚠️
components/playground/main.go	0.00%	11 Missing ⚠️
pkg/tui/colorstr/color.go	69.23%	8 Missing ⚠️
pkg/tui/colorstr/test_util.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2335      +/-   ##
==========================================
+ Coverage   47.65%   49.17%   +1.51%     
==========================================
  Files         307      327      +20     
  Lines       33819    34812     +993     
==========================================
+ Hits        16116    17116    +1000     
+ Misses      15715    15447     -268     
- Partials     1988     2249     +261     

Flag	Coverage Δ
cluster	43.19% <ø> (+1.25%)	⬆️
dm	25.44% <ø> (?)
playground	15.31% <23.26%> (?)
tiup	33.56% <36.00%> (+0.08%)	⬆️
unittest	?

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[kaaaaaaang]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-12-19 09:42:20.017326468 +0000 UTC m=+954031.054553397: ☑️ agreed by kaaaaaaang.

[kaaaaaaang]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [kaaaaaaang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment