grammar, json, llama: replace push on emplace if it possible

[GermanAizek]

It rather refers to code refactoring, but there is less code for inserts functions.

[github-actions]

📈 llama.cpp server for bench-server-baseline on Standard_NC4as_T4_v3 for phi-2-q4_0: 550 iterations 🚀

Expand details for performance related PR only

• Concurrent users: 8, duration: 10m
• HTTP request : avg=8508.88ms p(95)=20898.67ms fails=, finish reason: stop=481 truncated=69
• Prompt processing (pp): avg=98.93tk/s p(95)=450.98tk/s
• Token generation (tg): avg=34.62tk/s p(95)=48.4tk/s
• ggml-org/models/phi-2/ggml-model-q4_0.gguf parallel=8 ctx-size=16384 ngl=33 batch-size=2048 ubatch-size=256 pp=1024 pp+tg=2048 branch=emplace-cpp11 commit=c08d69f9245d00a9b7c863dc312096dcfcca6670

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