feat(mcp): export MCPClient type from '@ai-sdk/mcp' #24742

Job	Run time
Build Examples	8m 7s
Prettier	1m 7s
TypeScript	1m 34s
ESLint	1m 47s
Load Time Check (ai, 100)	2m 28s
Test (20)	3m 35s
Load Time Check (@ai-sdk/openai, 65)	2m 28s
Load Time Check (@ai-sdk/openai-compatible, 65)	2m 24s
Test (22)	2m 16s
Bundle Size Check	2m 21s
Load Time Check (@ai-sdk/anthropic, 65)	2m 30s
Load Time Check (@ai-sdk/google, 65)	2m 21s
load-time	2s
test	2s
	33m 2s

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