gh-138489: Add build-details.json generation to PC/layout

[zooba]

• Issue: PEP 739 build-details.json is missing on some platforms #138489

[zooba]

Supersedes #138490, and deliberately omits changes to the (deprecated) MSI installer, largely because there's no real value in dealing with the complexity of having multiple overlapping installs.

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #32469300 | 📁 Comparing cc522fc against main (f1588d4)

  🔍 Preview build  

14 files changed · ± 14 modified

± Modified

• download.html
• genindex-B.html
• genindex-C.html
• genindex-E.html
• genindex-H.html
• genindex-I.html
• genindex-P.html
• genindex-R.html
• genindex-S.html
• genindex-T.html
• and 4 more...

[zooba]

@hugovk Any chance of a beta 2 exception for this one (adds a new file to the file system layout)? No functional change to the runtime, and the PEP isn't new, we just never got around to implementing it for Windows until now.

[hugovk]

@zooba Yes, that's fine. Thanks for working on this.

[zooba]

For reviewers' sake, here's a sample file as generated by this script for a regular amd64 release from main:

{
  "schema_version": "1.0",
  "base_prefix": ".",
  "base_interpreter": "python.exe",
  "platform": "win-amd64",
  "language": {
    "version": "3.16",
    "version_info": {
      "major": 3,
      "minor": 16,
      "micro": 0,
      "releaselevel": "alpha",
      "serial": 0
    }
  },
  "implementation": {
    "name": "cpython",
    "cache_tag": "cpython-316",
    "version": {
      "major": 3,
      "minor": 16,
      "micro": 0,
      "releaselevel": "alpha",
      "serial": 0
    }
  },
  "abi": {
    "flags": [],
    "extension_suffix": ".cp316-win_amd64.pyd",
    "stable_abi_suffix": ".pyd"
  },
  "suffixes": {
    "source": [
      ".py"
    ],
    "bytecode": [
      ".pyc"
    ],
    "extensions": [
      ".cp316-win_amd64.pyd",
      ".pyd"
    ]
  },
  "libpython": {
    "dynamic": "python316.dll",
    "dynamic_stableabi": "python3.dll",
    "link_extensions": true
  },
  "c_api": {
    "headers": "Include"
  }
}