RFR: 8264859: Implement Context-Specific Deserialization Filters

[Roger Riggs]

JEP 415: Context-specific Deserialization Filters extends the deserialization filtering mechanisms with more flexible and customizable protections against malicious deserialization.  See JEP 415: https://openjdk.java.net/jeps/415.
The `java.io.ObjectInputFilter` and `java.io.ObjectInputStream` classes are extended with additional
configuration mechanisms and filter utilities.

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Commit messages:
 - JEP 415: Context-specific Deserialization Filters

Changes: https://git.openjdk.java.net/jdk/pull/3996/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3996&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264859
  Stats: 1583 lines in 5 files changed: 1475 ins; 24 del; 84 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3996.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3996/head:pull/3996

PR: https://git.openjdk.java.net/jdk/pull/3996