Add optional func to init Store

[vinhha96]

Propose

Hi @LyricTian ,
Based on this issue, I have a problem when init Store with the engine of Dabasase is InnoDB (because I use CloudSQL, and CloudSQL only supports InnoDB Engine). So, I can't use this library to init Store.

I had opened this PR to custom function init Store more flexible with Optional function, we can custom parameter to init Store. If not, this package will be inited with the default config.

And I had refactored code to make sure my changes do not break current logic.

Hopefully, the author will review and accepted this PR.

Changes

• Add option function to init Store
• Add unit test with my changes
• Update go mod to version go.1.17

Checklist

• Unit test pass on my locally