feat: add prepareIndexes() method to NewAdapterByDB()

[toeydevelopment]

I have discovered that when using the "NewAdapterByDB" function, it was missing the index preparation phase. To address this, I've decided to contribute by ensuring that this function performs the same initialization steps as other methods.

This pull request introduces several improvements to the MongoDB adapter:

1. Refactored the NewAdapterByDB function:
   • Added a new 'collection' variable to directly access the specified collection.
   • Implemented error handling for a.prepareIndexes() call.
2. Added a new prepareIndexes() method:
   • This method creates necessary indexes for improved query performance.
   • It's called during adapter initialization to ensure indexes are set up.
3. Updated the open() method:
   • Added error handling for a.prepareIndexes() call.
4. Modified the createIndex() call:
   • Updated to use the latest MongoDB driver syntax for index creation.
5. Updated go.mod dependencies:
   • Added several new indirect dependencies, likely due to updates in the MongoDB driver or other related packages.

[CLAassistant]

All committers have signed the CLA.

[coveralls]

coverage: 82.546% (-0.09%) from 82.636%
when pulling bf862ad on toeydevelopment:master
into 8560937 on casbin:master.

[github-actions]

🎉 This PR is included in version 3.7.0 🎉

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