Built in helper processing to make the API less awkward

[PolBreachIty]

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[Copilot]

Pull request overview

This PR refactors the Casbinex API to improve usability by standardizing input/output handling. The key changes include migrating from Erlang charlists to Elixir binary strings, wrapping NIF return values in result tuples, and introducing helper functions to handle both list and single-value inputs.

Key Changes:

• Migrated all string handling from charlists to binary strings throughout the codebase
• Wrapped NIF functions that return lists in {:ok, result} tuples for consistency
• Added overloaded helper functions to accept both lists and single values for filter operations

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/casbinex_test.exs	Updated all test cases to use binary strings instead of charlists and adjusted assertions to match new result tuple format
lib/casbinex/base.ex	New module containing NIF stub definitions that raise when not properly loaded
lib/casbinex.ex	Refactored to delegate to Base module and added helper functions for flexible input handling
config/test.exs	Updated configuration values from charlists to binary strings
c_src/casbin_nif.cpp	Implemented BinToString function, modified string conversion to use binaries, wrapped list returns in result tuples, and fixed error messages

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[Copilot]

Corrected spelling of 'createEnforcerdd' to 'createEnforcer'.

Suggested change

	raise "NIF createEnforcerdd/2 not implemented"
	raise "NIF createEnforcer/2 not implemented"