feat: add ExecutableNames and InstallPath fields to PkgSpec

[goog-harish]

Add ExecutableNames and InstallPath fields to PkgSpec to support identifying application binaries and installation directories.

• Add ExecutableNames ([]string) and InstallPath (string) to goolib.PkgSpec
• Display InstallPath in goolib.PkgSpec.PrettyPrint
• Add unit tests in goolib and persistence tests in googetdb
• Bump version to 3.3.3@0 in googet.goospec and add a release note

[goog-harish]

Tested this locally:

test.goospec

 cat /tmp/test.goospec 
{
  "name": "test-app",
  "version": "1.0.0@1",
  "arch": "noarch",
  "executableNames": ["test.exe", "helper.exe"],
  "installPath": "C:\\Program Files\\TestApp"
}

installed in a local db

 /tmp/googet -root "$TEST_ROOT" install -db_only -force ./test-app.noarch.1.0.0@1.goo
Install test-app.noarch.1.0.0@1.goo? (y/N): y
Installing test-app 1.0.0@1...
Installation of test-app completed

verified json includes the new fields

 /tmp/googet -root "$TEST_ROOT" installed --format=json                          
[
  {
    "SourceRepo": "",
    "DownloadURL": "",
    "Checksum": "",
    "LocalPath": "/tmp/tmp.JfI10QcEbC/cache/test-app.noarch.1.0.0@1.goo",
    "UnpackDir": "",
    "PackageSpec": {
      "Name": "test-app",
      "Version": "1.0.0@1",
      "Arch": "noarch",
      "Replaces": null,
      "Conflicts": null,
      "Provides": null,
      "Install": {},
      "Uninstall": {},
      "Verify": {},
      "ExternalProgramName": "",
      "ExecutableNames": [
        "test.exe",
        "helper.exe"
      ],
      "InstallPath": "C:\\Program Files\\TestApp"
    },
    "InstalledFiles": {},
    "InstallDate": 1788196085,
    "InstalledApp": {
      "Name": "",
      "Reg": ""
    }
  }
]