FEATURE: add csvsource backtesting support (rebase pull request #1389)

[c9s]

rebase pull request #1389

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[c9s]

@go-dockly you can continue your work from your fork (from this branch), and send the pull request to this branch algo-boyz/feat/csvsource.

[c9s]

git fetch upstream
git checkout -b algo-boyz/feat/csvsource upstream/algo-boyz/feat/csvsource

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1 out of 2 committers have signed the CLA.

✅ c9s
❌ go-dockly
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[c9s]

@go-dockly any update?

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Re-estimated karma: this pull request may get 2709 BBG

[c9s]

rebased and force pushed again.

@go-dockly any update?