Add deployer() function to the Az namespace

[levimatheri]

Add deployer() function to Az namespace to return information about the principal that initiated the current deployment operation.

Note: This is not ready to be merged, as the backend rollout hasn't completed yet.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 11412287689)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 11412287689

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 11412287689"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 11412287689

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 11412287689"

[github-actions]

Dotnet Test Results

    72 files   -     35      72 suites   - 35   28m 58s ⏱️ - 12m 56s
11 357 tests  -     25  11 357 ✅  -     25  0 💤 ±0  0 ❌ ±0 
26 445 runs   - 13 218  26 445 ✅  - 13 218  0 💤 ±0  0 ❌ ±0 

Results for commit c6cfaea. ± Comparison against base commit b09ba5e.