…t versions.

This commit introduces new gRPC OAuth2AuthenticationInterceptor in interceptors.py and CompanyModelService in company/servicer.py. The former one is responsible for OAuth2 authentication handling while the latter one provides a service for interacting with CompanyModel objects. Additionally, this update includes changes in the version of certain dependencies in Pipfile.lock. Several files were also renamed for better organization and readability.

The project version is updated to 0.6.1. In addition, updates in authorization checks are made across different Django ledger classes with a focus on enhancing control flow and efficiency. This refactor removes direct superuser checks embedded in business logic with a dedicated `get_superuser_authorization` method, streamlines permission checks, and ensures that special case handling (such as ledger lock, unlock, post and unpost) upholds the principle of early return for easier code maintenance.

…xIn class

Renamed the 'io_digest' module to 'io_context' for better clarity and improved the DigestContextMixIn class. The 'IO_DIGEST' and 'IO_DIGEST_EQUITY' attributes have been replaced with 'IO_DIGEST_UNBOUNDED' and 'IO_DIGEST_BOUNDED'. Correspondingly, new context names for these attributes have been created. Also added two properties 'from_datetime' and 'to_datetime' to the class 'IODigestContextManager' in the 'io_context' module. The imports have been updated to reflect the module name change.

The project version is updated to 0.6.1. In addition, updates in authorization checks are made across different Django ledger classes with a focus on enhancing control flow and efficiency. This refactor removes direct superuser checks embedded in business logic with a dedicated `get_superuser_authorization` method, streamlines permission checks, and ensures that special case handling (such as ledger lock, unlock, post and unpost) upholds the principle of early return for easier code maintenance.

…xIn class

Renamed the 'io_digest' module to 'io_context' for better clarity and improved the DigestContextMixIn class. The 'IO_DIGEST' and 'IO_DIGEST_EQUITY' attributes have been replaced with 'IO_DIGEST_UNBOUNDED' and 'IO_DIGEST_BOUNDED'. Correspondingly, new context names for these attributes have been created. Also added two properties 'from_datetime' and 'to_datetime' to the class 'IODigestContextManager' in the 'io_context' module. The imports have been updated to reflect the module name change.