Implement IBucket.get_size() method

[asuiu]

For Java and Python libs: Develop a get_size() method within the IBucket module to retrieve the size of a specified object within a bucket-based storage system.

Functional Requirements:

• Object Identification: The method must accept a parameter that uniquely identifies the object within the bucket (e.g., object key or path).
• Size Retrieval: The method must retrieve and return the size of the specified object, typically in bytes.
• Error Handling: Implement appropriate error handling for scenarios such as:
  • Object not found.
  • Insufficient permissions.
  • Connection errors.

Acceptance Criteria:

• The get_size() method must accurately return the size of an existing object.
• The method must handle cases where the object does not exist, raising an appropriate exception or returning a designated error value.
• The method should be robust and handle potential errors gracefully.
• The method should be efficient.

[asuiu]

Implement IBucket.get_size() method for Python