feat(backtesting) include button to export csv

[panapol-p]

What did not work before?

Include button to export CSV with orders in chart page #53

What have you changed and why?

add button for download trading history
add new api to get trading history by pair

This PR has:

• Been doubled checked by the author
• Tested for newly introduced bugs
• Included documentation

[codecov-commenter]

Codecov Report

Merging #86 (ac7c5d4) into main (3a4ef9d) will increase coverage by 0.08%.
The diff coverage is 21.73%.

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   50.07%   50.15%   +0.08%     
==========================================
  Files          14       15       +1     
  Lines        1909     2199     +290     
==========================================
+ Hits          956     1103     +147     
- Misses        895     1033     +138     
- Partials       58       63       +5     

Impacted Files	Coverage Δ
plot/chart.go	50.68% <21.73%> (ø)

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[rodrigo-brito]

Hi @panapol-p, thank you.
It looks great.

[rodrigo-brito]

Just a couple of comments.

[rodrigo-brito]

Hi @panapol-p, great job! 👏🏻👏🏻👏🏻
Just a small comment.

[panapol-p]

Hi, I have some questions.
The codecov/patch is calculated from the subfolder too, right?

[rodrigo-brito]

Hi @panapol-p, don't worry about the coverage. I try to improve it later. Your code is well tested.

[rodrigo-brito]

Thanks @panapol-p, great job!