RFR: 8365491: VSCode IDE: add basic configuration for the Oracle Java extension

[Manuel Hässig]

This PR adds a basic configuration for the [Oracle Java VSCode extension](https://marketplace.visualstudio.com/items?itemName=Oracle.oracle-java) to the `vscode-project-*` targets.

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Commit messages:
 - make/ide/vscode: add basic configuration for Oracle Java extension

Changes: https://git.openjdk.org/jdk/pull/26759/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26759&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365491
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26759.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26759/head:pull/26759

PR: https://git.openjdk.org/jdk/pull/26759