[chores] remove unnecessary files and add texttemplate test

[benja-wu]

1. Remove mesh-related CTL files
2. Remove common/go.go and common/option.go and test files.
3. Add texttemplate go test.

• local coverage rate raise from
  total: (statements) 61.8%
  to
  total: (statements) 62.3%

[codecov-commenter]

Codecov Report

Merging #139 (f6ba950) into main (56b55b0) will increase coverage by 11.97%.
The diff coverage is 68.08%.

@@             Coverage Diff             @@
##             main     #139       +/-   ##
===========================================
+ Coverage   46.48%   58.45%   +11.97%     
===========================================
  Files          38       36        -2     
  Lines        2590     2477      -113     
===========================================
+ Hits         1204     1448      +244     
+ Misses       1305      924      -381     
- Partials       81      105       +24     

Impacted Files	Coverage Δ
pkg/common/lazybuf.go	68.75% <ø> (+68.75%)	⬆️
pkg/common/os.go	0.00% <ø> (ø)
pkg/common/sample.go	0.00% <0.00%> (ø)
pkg/common/stat_aggregator.go	65.48% <0.00%> (+3.53%)	⬆️
pkg/common/sys_proc_linux.go	0.00% <ø> (ø)
pkg/common/sys_proc_others.go	0.00% <ø> (ø)
pkg/common/time.go	100.00% <ø> (+100.00%)	⬆️
pkg/common/uuid.go	71.42% <ø> (+71.42%)	⬆️
pkg/object/function/spec/fsm.go	94.44% <ø> (ø)
pkg/object/function/spec/function.go	44.00% <ø> (ø)
... and 23 more

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