Yiwei's pr for plugin manager#2

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leomem wants to merge 11 commits intomasterfrom

Commits on Jun 6, 2023

finish adding initial plugin class
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Commits on Jun 7, 2023

extracting plugin manager to be a separate class
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Commits on Jun 12, 2023

finish modifying client class and passing all the tests
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Commits on Jun 23, 2023

plugin manager interface modified (need future code clean up and cli options)
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Commits on Jun 28, 2023

modified plugin manager with cli options enabled
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Commits on Jul 7, 2023

modified the store wrapper code
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Commits on Jul 19, 2023

modifiying plugin params
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Commits on Jul 20, 2023

using environmental variables
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Commits on Jul 25, 2023

adding C++ init part
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Commits on Jul 27, 2023

cleaning up codes and adding comments
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Commits on Aug 9, 2023

updated with data path
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