RFR: 8292006: Move thread accessor classes to threadJavaClasses.hpp

[Ioi Lam]

To improve modularity and build time, move the declaration of the following accessor from classfile/javaClasses.hpp to runtime/threadJavaClasses.hpp:

+ java_lang_Thread_FieldHolder
+ java_lang_Thread_Constants
+ java_lang_ThreadGroup
+ java_lang_VirtualThread

Also move javaThreadStatus.hpp from share/classfile to share/runtime, where it belongs.

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Commit messages:
 - 8292006: Move thread accessor classes to threadJavaClasses.hpp

Changes: https://git.openjdk.org/jdk/pull/9788/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9788&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292006
  Stats: 1912 lines in 33 files changed: 1016 ins; 891 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/9788.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9788/head:pull/9788

PR: https://git.openjdk.org/jdk/pull/9788