playground: Set terminal title

[dveeden]

What problem does this PR solve?

This sets the terminal title to "TiUP Playground: " where name
is the last part of the datadir. With tiup -T foobar playground etc.
this name can be set. Also tiup client uses the same names.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release notes:

TiUP Playground now sets the terminal title to the name of the playground

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AstroProfundis

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[dveeden]

This needs to be tested with a few terminal emulators on macOS and Linux for compatibility issues.

[codecov-commenter]

Codecov Report

Merging #1506 (587633d) into master (783faee) will increase coverage by 4.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1506      +/-   ##
==========================================
+ Coverage   26.26%   30.72%   +4.45%     
==========================================
  Files         267      279      +12     
  Lines       23834    24420     +586     
==========================================
+ Hits         6261     7503    +1242     
+ Misses      16750    15920     -830     
- Partials      823      997     +174     

Flag	Coverage Δ
integrate	21.93% <100.00%> (+5.72%)	⬆️
playground	13.76% <100.00%> (?)
tiup	16.10% <ø> (-0.10%)	⬇️
unittest	22.72% <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/main.go	46.38% <100.00%> (+43.94%)	⬆️
pkg/cluster/api/binlog.go	0.00% <0.00%> (ø)
components/playground/instance/tiflash.go	61.98% <0.00%> (ø)
components/playground/instance/tikv_config.go	100.00% <0.00%> (ø)
components/playground/instance/pd.go	75.00% <0.00%> (ø)
components/playground/instance/tidb.go	83.78% <0.00%> (ø)
components/playground/instance/ticdc.go	0.00% <0.00%> (ø)
components/playground/instance/drainer.go	0.00% <0.00%> (ø)
components/playground/instance/process.go	84.90% <0.00%> (ø)
...onents/playground/instance/tiflash_proxy_config.go	83.33% <0.00%> (ø)
... and 22 more

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[AstroProfundis]

Works for me on ArchLinux connecting to an Debian VM via SSH.

[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 587633d