RFR: 8294961: Convert java.base/java.lang.reflect.ProxyGenerator to use the Classfile API to generate proxy classes

[Adam Sotona]

java.base java.lang.reflect.ProxyGenerator uses ASM to generate proxy classes.

This patch converts it to use Classfile API.

It is continuation of https://github.com/openjdk/jdk/pull/10991

Any comments and suggestions are welcome.

Please review.

Thank you,
Adam

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Commit messages:
 - 8294961: Convert java.base/java.lang.reflect.ProxyGenerator to use the Classfile API to generate proxy classes

Changes: https://git.openjdk.org/jdk/pull/17121/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17121&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294961
  Stats: 444 lines in 2 files changed: 19 ins; 191 del; 234 mod
  Patch: https://git.openjdk.org/jdk/pull/17121.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17121/head:pull/17121

PR: https://git.openjdk.org/jdk/pull/17121