cluster: replace TextToMetricFamilies with regexp

[xhebox]

What problem does this PR solve?

close #2680

What is changed and how it works?

1. add profile-dir to profile tiup
2. replace memory consuming TextToMetricFamilies

Check List

Tests

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

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 11.42857% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.35%. Comparing base (c757251) to head (65fe171).

Files with missing lines	Patch %	Lines
components/cluster/command/root.go	2.56%	38 Missing ⚠️
pkg/cluster/spec/util.go	58.33%	2 Missing and 3 partials ⚠️
components/dm/spec/logic.go	0.00%	2 Missing ⚠️
pkg/cluster/spec/alertmanager.go	0.00%	1 Missing ⚠️
pkg/cluster/spec/cdc.go	0.00%	1 Missing ⚠️
pkg/cluster/spec/dashboard.go	0.00%	1 Missing ⚠️
pkg/cluster/spec/drainer.go	0.00%	1 Missing ⚠️
pkg/cluster/spec/grafana.go	0.00%	1 Missing ⚠️
pkg/cluster/spec/monitoring.go	0.00%	1 Missing ⚠️
pkg/cluster/spec/pd.go	0.00%	1 Missing ⚠️
... and 10 more

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2695   +/-   ##
=======================================
  Coverage   42.34%   42.35%           
=======================================
  Files         424      424           
  Lines       47015    47018    +3     
=======================================
+ Hits        19908    19911    +3     
+ Misses      24425    24418    -7     
- Partials     2682     2689    +7     

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