RFR: 8322936: Update blessed-modifier-order.sh for default, sealed, and non-sealed

[Pavel Rappo]

Please review this PR to update `blessed-modifier.order.sh` for the `default`, `sealed`, `non-sealed`, and `strictfp` modifiers.

In a [discussion][] preceding this PR, it was agreed that the script should better refer to relevant JLS sections rather than to [`java.lang.reflect.Modifier#toString`][], which does not model Java source.

- the `sealed` and `non-sealed` class or interface modifiers were introduced in JEP 409, but have never been accounted for

- the `default` method modifier was introduced in Java 8, but has not been explicitly accounted for. It's unclear whether it was an omission or a conscious decision. The current edition of JLS [suggests] that in compilable, modern and customary formatted code, `default` appears alone and, thus, is always canonically ordered.

  However, a somewhat similar argument applies to the `public` modifier on an interface method. Its use is discouraged, yet the script would enforce its order if `public` appears not alone.

  So for completeness, this PR proposes to explicitly account for `default`.

* While not proposing to do anyting about it, this PR recognises (for the record) that `strictfp` class, interface, or method modifier became [obsolete][] in JDK 17.

I've run the updated script on JDK. The script found 8 missorted `sealed` and 20 missorted `default`. The script also found 3 false positive `default`:

- https://github.com/openjdk/jdk/blob/249d553659ab75a2271e98c77e7d62f662ffa684/src/java.desktop/share/classes/java/awt/dnd/DragSource.java#L526-L527
- https://github.com/openjdk/jdk/blob/98da03af50e2372817a7b5e381eea5ee6f2cb919/src/java.management/share/classes/javax/management/MBeanServerFactory.java#L91
- https://github.com/openjdk/jdk/blob/6765f902505fbdd02f25b599f942437cd805cad1/src/java.desktop/share/classes/javax/print/PrintServiceLookup.java#L193

None of those findings are addressed in this PR.

[discussion]: https://mail.openjdk.org/pipermail/core-libs-dev/2024-January/117347.html
[`java.lang.reflect.Modifier#toString`]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/reflect/Modifier.html#toString(int)
[suggests]: https://docs.oracle.com/javase/specs/jls/se21/html/jls-9.html#jls-9.4
[obsolete]: https://openjdk.org/jeps/306

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.org/jdk/pull/17242/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17242&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322936
  Stats: 9 lines in 1 file changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17242.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17242/head:pull/17242

PR: https://git.openjdk.org/jdk/pull/17242