refactor: refactor bollinger band indicator with the new series extend component

[c9s]

No description provided.

[bbgokarma-bot]

Welcome back! @c9s, This pull request may get 337 BBG.

[bbgokarma-bot]

Re-estimated karma: this pull request may get 362 BBG

[codecov]

Codecov Report

Merging #823 (2ef8ecf) into main (975d0d6) will decrease coverage by 0.01%.
The diff coverage is 38.37%.

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   19.93%   19.91%   -0.02%     
==========================================
  Files         362      364       +2     
  Lines       27631    27665      +34     
==========================================
+ Hits         5507     5509       +2     
- Misses      21591    21629      +38     
+ Partials      533      527       -6     

Impacted Files	Coverage Δ
pkg/indicator/stddev_callbacks.go	0.00% <0.00%> (ø)
pkg/strategy/bollmaker/strategy.go	2.94% <0.00%> (ø)
pkg/strategy/bollmaker/trend.go	0.00% <0.00%> (ø)
pkg/strategy/xmaker/strategy.go	2.67% <0.00%> (ø)
pkg/indicator/stddev.go	25.58% <25.58%> (ø)
pkg/indicator/boll.go	46.77% <75.86%> (+3.91%)	⬆️
pkg/indicator/sma.go	50.00% <0.00%> (-8.63%)	⬇️

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[bbgokarma-bot]

Hi @c9s,

Well done! 372 BBG has been sent to your polygon wallet. Please check the following tx:

https://polygonscan.com/tx/0x4dabe200d07af646344908a657f24047098e6b8f0170e0b0895e4412a60c6ee5

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