Feat/devx 336 abstract paymaster

[VGabriel45]

Summary

Related Issue: # (DEVX-336)

Change Type

• Bug Fix
• Refactor
• New Feature
• Breaking Change
• Documentation Update
• Performance Improvement
• Other

Checklist

• My code follows this project's style guidelines
• I've reviewed my own code
• I've added comments for any hard-to-understand areas
• I've updated the documentation if necessary
• My changes generate no new warnings
• I've added tests that prove my fix is effective or my feature works
• All unit tests pass locally with my changes
• Any dependent changes have been merged and published

Additional Information

The context of this PR is to optimize developer experience of the SDK.
This PR will remove the need for the user/developer to create the Paymaster instance and then provide it to the "create()" method config. Paymaster can be easily setup by only providing an "apiKey" in the config.

Old method of creating instance and providing it to the config by the user/developer is still available for compatibility reasons.

[linear]

DEVX-336 Remove the need to create paymaster instance separately

[livingrockrises]

reviewed