feat!: rename LDAIMetrics.usage and AIGraphMetrics.usage to .tokens #666

Job	Run time
server-ai-linux (3.13)	20s
server-ai-linux (3.11)	20s
server-ai-linux (3.14)	21s
server-ai-langchain-linux (3.11)	19s
server-ai-linux (3.10)	17s
server-ai-linux (3.12)	17s
server-ai-langchain-linux (3.10)	20s
server-ai-openai-linux (3.13)	26s
server-ai-openai-linux (3.11)	24s
server-ai-langchain-linux (3.13)	23s
server-ai-langchain-windows (3.10)	29s
server-ai-langchain-linux (3.14)	22s
server-ai-windows (3.14)	28s
server-ai-optimization-linux (3.10)	10s
server-ai-openai-linux (3.10)	28s
server-ai-optimization-windows (3.11)	16s
server-ai-optimization-windows (3.10)	19s
server-ai-optimization-windows (3.13)	32s
server-ai-optimization-linux (3.13)	14s
server-ai-openai-linux (3.12)	25s
server-ai-openai-windows (3.12)	27s
server-ai-langchain-windows (3.12)	31s
server-ai-optimization-linux (3.12)	9s
server-ai-optimization-linux (3.11)	14s
server-ai-openai-linux (3.14)	26s
server-ai-optimization-windows (3.12)	19s
server-ai-langchain-windows (3.14)	33s
server-ai-langchain-windows (3.13)	23s
server-ai-windows (3.11)	31s
server-ai-langchain-linux (3.12)	18s
server-ai-optimization-windows (3.14)	21s
server-ai-windows (3.13)	22s
server-ai-openai-windows (3.10)	38s
server-ai-openai-windows (3.13)	27s
server-ai-langchain-windows (3.11)	24s
server-ai-optimization-linux (3.14)	16s
server-ai-openai-windows (3.11)	31s
server-ai-openai-windows (3.14)	31s
server-ai-windows (3.12)	38s
server-ai-windows (3.10)	21s
	15m 30s

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