Versionless feature 1.0 (#296)

[arunvenmany-ibm]

• Versionless feature changes. Added platform component

  1. updated xsd, featurelist xml and features.json to 24.0.0.8
  2. added completion to show all platforms

• Versionless feature changes. Added hover for platform components

  1. Added description for platform

• platform diagnostic scenarios

  1. check for platform validity
  2. check for platform uniqueness
  3. check for conflicting platforms( ie, platforms j2ee and jakartaee should not be used together

• Versioned feature and platform validation diagnostics

  1. if platforms are already included and its not matching with the platforms specified in versioned features, show diagnostic

• Version less feature and platform validation diagnostics

  1. if platforms is not included and no versioned feature is included and versionless feature is included, then show diagnostic
  2. if platforms are included and only versionless feature included, check for common platforms for versionless feature and match with selected platform. If not matching, throw error
  3. if platforms are included and both versioned and versionless features are added, check for common platform from versionless feature, versioned feature and match with platforms