Add Java 25 build compatibility for TinkerPop 3.8

[jrepp]

Summary

Enables building TinkerPop with Java 25 by updating Groovy and fixing annotation processor configuration.

Changes

Build Configuration

1. pom.xml: Updated groovy.version to 4.0.30-SNAPSHOT (includes ASM 9.9 for Java 25 support)
2. gremlin-groovy/pom.xml: Added explicit annotationProcessorPaths for GremlinDslProcessor

Test Fixes

3. LambdaRestrictionStrategy.java: Use case-insensitive lambda detection (Java 25 changed class naming from $$Lambda$N/... to $$Lambda/0x...)
4. ImportGremlinPluginTest.java: Handle Math.TAU field added in Java 19

Build Instructions

mvn clean install -DskipTests -Denforcer.skip=true -Dmaven.javadoc.skip=true

Prerequisites: Local Groovy 4.0.30-SNAPSHOT with ASM 9.9 - see https://github.com/apache/groovy/pull/2346

Test Results

Module	Tests	Failures	Skipped
gremlin-core	8500	0	45
gremlin-server	8723	0	24
hadoop-gremlin	846	3	700

Note: hadoop-gremlin failures are pre-existing Hadoop + Java 25 incompatibility issues, not related to this PR.

Blocking Dependency

⚠️ This PR cannot be merged until apache/groovy#2346 lands in a Groovy 4.x release.

The linked Groovy PR updates ASM from 9.7 to 9.9, which is required to parse Java 25 class files (class file version 69). Without this ASM update, Groovy cannot compile or load classes built with Java 25, causing IllegalArgumentException errors during bytecode analysis.

Once that Groovy PR is released (likely as 4.0.25 or later), update the groovy.version in pom.xml from 4.0.30-SNAPSHOT to the actual release version.

Notes for Maintainers

• The annotationProcessorPaths change is backward compatible and follows Maven best practices
• The enforcer plugin's Java version restriction [11,18) will need updating for official Java 25 support

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :warning: Please upload report for BASE (3.8-dev@59b68cf). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.8-dev    #3283   +/-   ##
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  Coverage           ?   77.31%           
  Complexity         ?    15022           
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  Files              ?     1159           
  Lines              ?    71961           
  Branches           ?     8031           
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  Hits               ?    55639           
  Misses             ?    13268           
  Partials           ?     3054           

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[Cole-Greer]

Hi @jrepp, thanks for opening this PR, as well as driving the necessary fixes in groovy as well. I will try to find some time to test these changes out locally. Unfortunately we probably can't move forward until the groovy fix is complete, but I will try to get a preliminary review completed soon.