Dual Caffeine support in the agent.

[jtduffy]

Overview

Resolves #2731

Implement support for Caffeine v2 and v3 in the agent. The version of Caffeine is selected based on the Java runtime version.

• Caffeine 2.9.3 - For Java 8-10 (uses sun.misc.Unsafe)
• Caffeine 3.2.3 - For Java 11+ (uses VarHandle)

Forcing Caffeine v2

A config exists, that if set to true, will force the use of Caffeine v2, even if the Java version is 11+:

• System property: newrelic.config.collectionfactory.forcev2
• Environment variable: NEW_RELIC_COLLECTIONFACTORY_FORCEV2

(Not available as a yaml config since the AgentCollectionFactory is loaded prior to any services being
spun up).

See the DualCaffeineReadme.md file for full details.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 60.63830% with 148 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.33%. Comparing base (dad3cf9) to head (0df1cdc).
⚠️ Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
...ewrelic/agent/util/Caffeine2CollectionFactory.java	40.38%	61 Missing and 1 partial ⚠️
...ewrelic/agent/bridge/DefaultCollectionFactory.java	0.00%	26 Missing ⚠️
...om/newrelic/agent/util/AgentCollectionFactory.java	51.28%	14 Missing and 5 partials ⚠️
...a/com/newrelic/bootstrap/EmbeddedJarFilesImpl.java	42.10%	9 Missing and 2 partials ⚠️
...java/com/newrelic/weave/utils/WeakKeyLruCache.java	87.09%	5 Missing and 3 partials ⚠️
...om/newrelic/agent/bridge/CacheRemovalListener.java	0.00%	6 Missing ⚠️
...rc/main/java/com/newrelic/agent/TimedTokenSet.java	72.22%	3 Missing and 2 partials ⚠️
...n/weaver/extension/ExtensionHolderFactoryImpl.java	0.00%	3 Missing ⚠️
...gent/profile/v2/TransactionProfileSessionImpl.java	57.14%	3 Missing ⚠️
...va/com/newrelic/agent/config/JavaVersionUtils.java	50.00%	1 Missing and 1 partial ⚠️
... and 3 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2807      +/-   ##
============================================
- Coverage     70.38%   70.33%   -0.06%     
- Complexity    10386    10448      +62     
============================================
  Files           869      872       +3     
  Lines         42017    42250     +233     
  Branches       6386     6413      +27     
============================================
+ Hits          29575    29715     +140     
- Misses         9560     9638      +78     
- Partials       2882     2897      +15     

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