FOCUS 1.4 phase 3: add ContractCommitment dataset

Parent: #2120
Depends on: #2124 (phase 1) and #2127 (phase 2)

Goal

Add the FOCUS 1.3 Contract Commitment supplemental dataset across raw ingestion, transforms, hub functions, and the Latest aliases.

FOCUS 1.3 Contract Commitment columns (14 mandatory)

Scope

`IngestionSetup_RawTables.kql`

• Add new table `ContractCommitment_raw` mirroring the column shape above (all string types in raw, parsed in transform).

`IngestionSetup_v1_3.kql`

• Add `ContractCommitment_transform_v1_3()` function: trivially passes through raw columns to typed final columns.
• Add `ContractCommitment_final_v1_3` table with the 14 columns above plus standard hub add-ons (`x_IngestionTime`, `x_SourceName`, `x_SourceProvider`, `x_SourceType`, `x_SourceVersion`).
• Add update policy `ContractCommitment_raw` -> `ContractCommitment_transform_v1_3` -> `ContractCommitment_final_v1_3`.

`HubSetup_v1_3.kql`

• Add `ContractCommitment_v1_3()` function reading `ContractCommitment_final_v1_3` directly. No older versions to union.

`HubSetup_Latest.kql`

• Add unversioned `ContractCommitment()` aliasing to `ContractCommitment_v1_3()`.

Branch

`flanakin/focus14-phase3-contractcommitment` off `flanakin/focus14-phase2-hubs-1.3` (depends on phase 2 for the v1_3 hub schema). PR target: `flanakin/focus14-phase2-hubs-1.3` until phase 2 merges, then will retarget.

Done when

• New raw, final, and hub tables / functions land.
• Pester tests still pass.
• Bicep compiles cleanly.

Start by comparing the requested changes with the existing patterns in IngestionSetup_RawTables.kql, IngestionSetup_v1_3.kql, HubSetup_v1_3.kql, and HubSetup_Latest.kql, using the phase 2 branch as the schema reference. Run the Pester tests and compile the Bicep configuration; done means the raw, final, hub, and Latest ContractCommitment objects exist and both checks pass.