Update request headers to match upstream requirements

[robberwick]

This pull request includes several changes to the src/pylibrelinkup/pylibrelinkup.py file, focusing on improving the functionality and structure of the PyLibreLinkUp class. The most important changes include the addition of new methods for API calls, the introduction of a new attribute, and updates to the authentication process.

New Methods and Attributes:

• Added _call_api, _set_token, _set_account_id_hash, _get_graph_data_json, _get_headers, and _get_logbook_json methods to handle API interactions and manage tokens and account IDs. [1] [2]
• Introduced account_id_hash attribute to store a hashed version of the account ID for API requests. [1] [2]

Authentication Process:

• Updated the authenticate method to use the new LoginResponse model for validation and to set the token and account ID hash using the new methods.

Imports and Headers:

• Added imports for hashlib and ValidationError to support new functionality.
• Updated the _HEADERS dictionary to HEADERS and modified the version number.

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Comments skipped due to low confidence (3)

src/pylibrelinkup/pylibrelinkup.py:70

• The docstring for the _call_api method should specify the return type as dict instead of object.

def _call_api(self, url: str = None) -> dict:

src/pylibrelinkup/pylibrelinkup.py:33

• [nitpick] The HEADERS dictionary should be named _HEADERS to maintain consistency with the existing code style.

HEADERS: dict[str, str] = {

src/pylibrelinkup/pylibrelinkup.py:87

• Ensure that the new account_id_hash attribute is properly validated and tested.

self.account_id_hash = hashlib.sha256(account_id.encode()).hexdigest()