Added Support for variable library creation and update

[achrafcei]

• Updated requires-python to allow Python 3.13.
• Added support for Python 3.11 and 3.12 in classifiers.
• Expanded __all__ in __init__.py to include new variable library functions.
• Introduced _encode_b64 and _create_variable_library_definition functions in _functions.py updated with create and update variable libraries

Tested and validated :

Test example :

import sempy_labs.variable_library as vl

variables_with_valuesets = [
    {
        "name": "api_endpoint",
        "type": "String",
        "value": "https://api-dev.example.com/v1",
        "note": "API endpoint URL"
    },
    {
        "name": "timeout_seconds", 
        "type": "Number",
        "value": 30,
        "note": "Request timeout in seconds"
    },
    {
        "name": "max_connections_new",
        "type": "Number",
        "value": 100,
        "note": "Maximum number of database connections"
    },
    {
        "name": "retry_count",
        "type": "Number", 
        "value": 3
    }
]

value_sets_example = [
    {
        "name": "Production",
        "variableOverrides": [
            {"name": "api_endpoint", "value": "https://api.example.com/v1"}
        ]
    },
    {
        "name": "Staging",
        "variableOverrides": [
            {"name": "api_endpoint", "value": "https://api-staging.example.com/v1"}
        ]
    }
]
result = vl.create_variable_library(
    variable_library_name="DEVConfig",
    description="Configuration variables for development environment",
    variables=variables_with_valuesets,
    value_sets=value_sets_example,
    workspace="Temp-ws"
)
result = vl.update_variable_library_definition(
    variable_library="newname",
    variables=variables_with_valuesets,
    value_sets=value_sets_example,
    workspace="Temp-ws"
)
result = vl.update_variable_library(variable_library="newname", active_value_set="Production")

[m-kovalsky]

instead of 'optional', use default=None. You can see this is the standard across semantic link labs.

[m-kovalsky]

no point in returning a string

[m-kovalsky]

please follow the convention for other such functions. no need for an if statement here. just print that the variable library was updated successfully. if an issue occurred, an error would be caught by _base_api.

[m-kovalsky]

as before, don't need these if statements.

[m-kovalsky]

While the update definition function is fine, it may be useful to have functions like 'set_variable' where one can add/update an existing variable definition. And along the same lines, set_value_set. That would make adding/updating a variable much easier than trying to do it via updating the entire definition.

[achrafcei]

I'll update the code with the fixed and suggestions, thanks @m-kovalsky