Support Cloudflare function calling

[BrandonStudio]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

Complement Cloudflare provider:

• Support function calling
• Add Image-to-Text models
• Complement tests

📝 补充信息 | Additional Information

Won't do in this PR:

• Embeddings
• Text-to-Image
• Text-to-Speech

NOTES:

• To improve function calling performance, system prompt of plugins is disabled within Cloudflare.
• Requests with tools get non-stream response.

Former #3402

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.56%. Comparing base (49e1e08) to head (40b8f0f).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4671      +/-   ##
==========================================
+ Coverage   92.53%   92.56%   +0.03%     
==========================================
  Files         522      522              
  Lines       37335    37462     +127     
  Branches     2351     3539    +1188     
==========================================
+ Hits        34547    34676     +129     
+ Misses       2788     2786       -2     

Flag	Coverage Δ
app	92.56% <100.00%> (+0.03%)	⬆️
server	97.26% <ø> (ø)

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