Adds blackbox bypass and refactors authentication methods

Introduces a blackbox bypass option to help mitigate 403 errors by allowing the skip of certain security payloads.

Renames the connection flow to `AuthenticateAsync` for better clarity and refines the internal logic for registry access and byte encoding.

Refactors authentication flow

Streamlines the authentication process by removing the OneOf library and simplifying the token retrieval logic.

Improves the reliability of the connection and token acquisition by adding an OPTIONS request and adjusting header configurations.

Adds browserEnvMask to the fingerprint.

Simplifies authentication flow.

Refactors the authentication flow to streamline error handling.
Removes the `OneOf` return type and dedicated error records for wrong credentials and captcha requirements, returning null instead to indicate failure.
This change simplifies the calling code by allowing it to directly check for a null session, instead of having to handle different error types.

Removes example application

Removes the example console application, as it is no longer needed in the repository. The application was used for local testing of the Gameforge Connector library.

Updates release branch to master

Updates the release branch in the CI workflow to `master` to align with the current repository configuration.

Adds CI workflow for GameforgeConnector

Sets up a CI workflow to automatically build, test, pack, and push the GameforgeConnector project to a NuGet feed on every push to the master branch.

This ensures that the project is always buildable and that new versions are automatically published.