feat: Add support for JSON request parsing in Enforcer

[Shiva953]

Addresses #460

This PR adds support for JSON request parsing in the Enforcer module. The new method enableAcceptJsonRequest has been implemented to facilitate parsing request properties as JSON strings which enhances the capability of the Enforcer to handle object ownership, improving the overall functionality and versatility of the system.

[casbin-bot]

@nodece @Shivansh-yadav13 please review

[CLAassistant]

All committers have signed the CLA.

[hsluoyz]

@Shiva953 fix CI:

[geoffreygarrett]

hmm lol