RFR: 8313452: Improve Classfile API attributes handling safety

[Adam Sotona]

This PR improved Classfile API attributes handling safety by introduction of attribute stability indicator
and by extension of UnknownAttributesOption to more general AttributesProcessingOption.

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Commit messages:
 - fixed remaining listFromTrustedArrayNullsAllowed calls to listFromTrustedArray
 - added test for AttributesProcessingOption.DROP_UNKNOWN_ATTRIBUTES
 - re-added AttributeStability.UNKNOWN
 - dropped AttributeStability.UNKNOWN
 - 8313452: Improve Classfile API attributes handling safety
 - fixing javadoc
 - fixing javadoc
 - fixing javadoc
 - fixing javadoc
 - fixing javadoc
 - ... and 3 more: https://git.openjdk.org/jdk/compare/37c756a7...350588bd

Changes: https://git.openjdk.org/jdk/pull/15101/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15101&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313452
  Stats: 3753 lines in 37 files changed: 3583 ins; 44 del; 126 mod
  Patch: https://git.openjdk.org/jdk/pull/15101.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15101/head:pull/15101

PR: https://git.openjdk.org/jdk/pull/15101