List All Log Analytics Workspace Functions

# Feature Request: List All Log Analytics Workspace Functions

## Related command
`az monitor log-analytics workspace saved-search list`

## Is your feature request related to a problem? Please describe.
The current implementation of listing Log Analytics workspace functions is missing the built-in, non-modifiable functions. This makes it difficult to get a comprehensive view of all available functions in a workspace, especially those that are part of the default set and cannot be edited.

## Describe the solution you'd like
I would like to see ALL functions when listing them, not just the ones that are editable. This should include:
1. User-defined (custom) functions
2. Built-in functions that come with the workspace
3. Any other non-modifiable functions that are available in the workspace

Ideally, there should be a way to distinguish between these different types of functions in the output.

## Describe alternatives you've considered
I've explored several alternatives but haven't found a satisfactory solution:
1. Using the REST API directly: I couldn't find any endpoint that exposes all functions, including the non-modifiable ones. SavedSearches yields same results.

## Additional context
Here's a screenshot showing the discrepancy between the functions visible in the Azure portal which are missing from response.