[GenAI] Add support for io.dropwizard.metrics:metrics-core:4.1.12.1 using gpt-5.4

[vjovanov]

What does this PR do?

Fixes: #1370

This PR introduces tests and metadata for io.dropwizard.metrics:metrics-core:4.1.12.1, enabling support for this library.

Summary:

• Strategy: optimistic_dynamic_access_iterative_pi_gpt-5.4
• Agent: pi
• Model: gpt-5.4
• Input tokens: 279000
• Cached input tokens: 3390208
• Output tokens: 46966
• Entries: 0
• Iterations: 5
• Library coverage percentage: 52.63
• Generated lines of code: 425
• Tested library lines of code: 839

Stats from stats/<groupId>/<artifactId>/<metadata-version>/stats.json:

Dynamic access coverage:

• Overall: 0/0 covered calls (100.00%)

Library coverage:

• Instruction: 4554/8307 (54.82%)
• Line: 839/1594 (52.63%)
• Method: 255/460 (55.43%)

[jormundur00]

library-new-request PRs must stay scoped to one library. This PR targets io.dropwizard.metrics:metrics-core:4.1.12.1 but also adds com.baomidou:mybatis-plus:3.5.3 metadata, tests, and commits. Please remove the unrelated mybatis-plus changes from this PR.

Clearing stale changes-requested review after branch cleanup.

[jormundur00]

Checked scope, test quality, and CI for io.dropwizard.metrics:metrics-core:4.1.12.1. The PR stays scoped to one library, the test is library-specific and runs under native-image coverage, and I found no blocking issues.