RFR: 8311084: Add typeSymbol() API for applicable constant pool entries

[Chen Liang]

5 Constant Pool entries, namely ConstantDynamicEntry, InvokeDynamicEntry, FieldRefEntry, MethodRefEntry, and InterfaceMethodRefEntry should have a typeSymbol() API to return the nominal/symbolic descriptor (ClassDesc or MethodTypeDesc).

This API is not added to NameAndTypeEntry itself, for a NameAndTypeEntry only knows if its type should be a field or method type from the other entries that refer to it.

This is one of the issues discussed in this mailing list thread: https://mail.openjdk.org/pipermail/classfile-api-dev/2023-June/000381.html

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Commit messages:
 - Add typeSymbol API for a few constant pool entries

Changes: https://git.openjdk.org/jdk/pull/14706/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14706&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311084
  Stats: 46 lines in 7 files changed: 44 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14706.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14706/head:pull/14706

PR: https://git.openjdk.org/jdk/pull/14706