[pbi-fixer] Add add_last_refresh_table: add a 1-row 'Last Refresh' table with M partition

[KornAlexander]

Adds a sempy_labs fixer add_last_refresh_table() that add a 1-row 'Last Refresh' table with M partition.

Adds one source file (src/sempy_labs/semantic_model/_Add_Table_LastRefresh.py) plus one re-export line in the matching __init__.py. No other files touched, no shared helpers, no dependency on any other PR.

Part of the PBI Fixer contribution. Tracking issue: #1185

[Copilot]

Pull request overview

Adds a new semantic_model fixer, add_last_refresh_table(), intended to inspect the semantic model behind a report and add a one-row “Last Refresh” M-partition table plus a convenience measure. This fits the ongoing PBI Fixer work by adding another standalone semantic-model remediation/helper entry point.

Changes:

• Adds src/sempy_labs/semantic_model/_Add_Table_LastRefresh.py with the new logged helper function and its supporting constants.
• Resolves report/workspace context to the backing semantic model, supports a scan_only mode, and conditionally creates a table/column/measure.
• Re-exports add_last_refresh_table from src/sempy_labs/semantic_model/__init__.py.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/sempy_labs/semantic_model/_Add_Table_LastRefresh.py	New fixer implementation for detecting/adding a “Last Refresh” semantic-model table and measure.
src/sempy_labs/semantic_model/__init__.py	Re-exports the new helper from the package namespace.

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