add bulk forecast and comment api endpoint

[lsabor]

closes #4552

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🚀 Preview Environment

Your preview environment is ready!

Resource	Details
🌐 Preview URL	https://metaculus-pr-4554-issue-4552-bulk-forecast-comme-preview.mtcl.cc
📦 Docker Image	ghcr.io/metaculus/metaculus:issue-4552-bulk-forecast-comment-85a5fb6
🗄️ PostgreSQL	NeonDB branch preview/pr-4554-issue-4552-bulk-forecast-comme
⚡ Redis	Fly Redis mtc-redis-pr-4554-issue-4552-bulk-forecast-comme

Details

• Commit: 85a5fb69cad123a16f3dbcb81278b37a1edb4e95
• Branch: issue/4552/bulk-forecast-comment
• Fly App: metaculus-pr-4554-issue-4552-bulk-forecast-comme

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