[GenAI] Add support for com.alibaba.fastjson2:fastjson2:2.0.53 using gpt-5.5

[vjovanov]

What does this PR do?

Fixes: #2192

This PR introduces tests and metadata for com.alibaba.fastjson2:fastjson2:2.0.53, enabling support for this library.

Summary:

• Strategy: dynamic_access_main_sources_pi_gpt-5.5
• Agent: pi
• Model: gpt-5.5
• Input tokens: 268672
• Cached input tokens: 3245056
• Output tokens: 23356
• Metadata entries: 47
• Test-only metadata entries: 60
• Iterations: 9
• Library coverage percentage: 12.32
• Generated lines of code: 302
• Tested library lines of code: 9950

Forge

• Forge monitored branch: origin/master
• Forge branch: master
• Forge commit hash: eece5f4c4d04e88b1b154b86fa6532f07e3f836b

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

Dynamic access coverage:

• Overall: 30/529 covered calls (5.67%)
• Reflection: 29/525 covered calls (5.52%)
• Resources: 1/4 covered calls (25.00%)

Library coverage:

• Instruction: 48898/394976 (12.38%)
• Line: 9950/80789 (12.32%)
• Method: 830/5850 (14.19%)

Local CI Verification

• Status: success
• Commands run: 2
• Fixup attempts: 0

[jormundur00]

The PR still needs stronger dynamic-access coverage before it can be accepted. The summary reports 30/529 covered dynamic-access calls (5.67%), which is below the >20% minimum we use for library-new-request PRs when there are dynamic-access calls to cover. Please expand the test so it exercises more of the behavior that requires the submitted metadata, then refresh the coverage evidence.