feat: add inline OpenSSL CodeLens feature

[jnovack]

Summary

Add inline OpenSSL previews for PEM certificates and CSRs using CodeLens, while keeping the existing Show OpenSSL preview command behavior unchanged.

This gives users a lightweight summary above certificate blocks and a quick path to open the full parsed OpenSSL output without modifying file contents.

What changed

• add automatic CodeLens previews above PEM certificate and CSR blocks
• add CodeLens actions to:
  • load a preview on demand
  • refresh a parsed preview
  • open full details using the same preview surface as the existing command
• auto-load visible previews only when the file is within configured safety limits, including a default auto-load cap of 3
• avoid eager parsing for large trust stores or files with many certificates
• add preview settings for CodeLens enablement and auto-load limits
• activate on startup so inline CodeLens can appear without first running a command

Validation

I attempted npm run compile, however the current branch does not compile cleanly in this environment:

• src/lib/openssl.ts(96,13): error TS2794: Expected 1 arguments, but got 0.
• src/test/index.ts(13,29): error TS2307: Cannot find module 'vscode/lib/testrunner'

I have another branch which refactors the build for 2026. I kept the PRs separate.

I did NOT version bump.

[jnovack]

Settings Screenshot: