feat(kas): collect metrics

[sujankota]

• Adds otel based tracing to kas methods: publicKey and rewrap
  • adds trace top level config to viper config, including trace.enabled (boolean) for enabling otel tracer, and trace.folder for setting the folder to store the trace.log file
• Adds new examples benchmark command to run encrypt/decrypt and rewrap benchmarks
  • Also adds a job to the checks.yaml to run it, but it is pretty bare-bones for now, and doesn't have any checks against performance regressions or anything.
• Variety of small linter fixes

tdf3:
Benchmark Results:
Total Requests: 5000
Successful Requests: 5000
Failed Requests: 0
Concurrent Requests: 50
Total Time: 1m7.704277611s
Average Latency: 673.018399ms
Throughput: 73.85 requests/second

nano:
Benchmark Results:
Total Requests: 5000
Successful Requests: 4992
Failed Requests: 8
Concurrent Requests: 50
Total Time: 57.72426082s
Average Latency: 575.422342ms
Throughput: 86.48 requests/second

Error Summary:
ReadNanoTDF error: readSeeker.Seek failed: error making nano rewrap request to kas: error making rewrap request: rpc error: code = PermissionDenied desc = request error
rpc error: code = PermissionDenied desc = forbidden: 8 occurrences


Trace Statistics:

publickey:
  Total Requests: 2
  Average Duration: 0.073 ms (72.647 µs, 72647 ns)
  Min Duration: 0.030 ms (2[9](https://github.com/opentdf/platform/actions/runs/12053261131/job/33608512613?pr=1702#step:17:10).937 µs, 29937 ns)
  Max Duration: 0.[11](https://github.com/opentdf/platform/actions/runs/12053261131/job/33608512613?pr=1702#step:17:12)5 ms (115.357 µs, 115357 ns)

rewrap-tdf3:
  Total Requests: 5000
  Average Duration: 316.499 ms (316498.907 µs, 316498907 ns)
  Min Duration: 23.608 ms (23607.787 µs, 23607787 ns)
  Max Duration: 979.418 ms (979417.815 µs, 979417815 ns)

rewrap-nanotdf:
  Total Requests: 4776
  Average Duration: 320.718 ms (320717.904 µs, 320717904 ns)
  Min Duration: 22.802 ms (22801.981 µs, 22801981 ns)
  Max Duration: 874.830 ms (874829.7[13](https://github.com/opentdf/platform/actions/runs/12053261131/job/33608512613?pr=1702#step:17:14) µs, 874829713 ns)

[jrschumacher]

@sujankota could we add a github-script step to post the results of the benchmark process to the PR? Something like:

Credit ChatGPT

- name: Post benchmark results as a PR comment
  if: ${{ github.event_name == 'pull_request' }}
  uses: actions/github-script@v6
  with:
    script: |
      const results = process.env.RESULTS;
      const commentBody = `
<details>
  <summary>Benchmark Results</summary>

  \`\`\`shell
  ${results}
  \`\`\`
</details>
      `;
      const { data: comments } = await github.rest.issues.listComments({
        owner: context.repo.owner,
        repo: context.repo.repo,
        issue_number: context.issue.number,
      });

      const existingComment = comments.find(comment => 
        comment.user.login === 'github-actions[bot]' && 
        comment.body.includes('<summary>Benchmark Results</summary>')
      );

      if (existingComment) {
        await github.rest.issues.updateComment({
          owner: context.repo.owner,
          repo: context.repo.repo,
          comment_id: existingComment.id,
          body: commentBody,
        });
      } else {
        await github.rest.issues.createComment({
          owner: context.repo.owner,
          repo: context.repo.repo,
          issue_number: context.issue.number,
          body: commentBody,
        });
      }
    env:
      RESULTS: ${{ steps.previous_step_name.outputs.results }}