Various changes to the bicep jsonrpc command

[anthony-c-martin]

• Add type information to JSONRPC bicep/getMetadata parameters & outputs
• Add new method bicep/getFileReferences to obtain a list of files that are referenced by a given file.
• Set up tracing so that BICEP_TRACING_ENABLED configures verbose JSONRPC logging
• Add JSONRPC command documentation.

May help with the implementation for #5715
Closes #12650

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 7618307197)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 7618307197

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 7618307197"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 7618307197

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 7618307197"

[github-actions]

Test Results

    66 files   -     33      66 suites   - 33   22m 59s ⏱️ - 28m 5s
10 636 tests  -     19  10 636 ✅  -     19  0 💤 ±0  0 ❌ ±0 
25 771 runs   - 12 881  25 771 ✅  - 12 881  0 💤 ±0  0 ❌ ±0 

Results for commit 95e2d3a. ± Comparison against base commit c7427c7.

♻️ This comment has been updated with latest results.

[majastrz]