wip: support tool retry on timeout via idempotencyKey param in CallToolRequestParams #1595

Job	Run time
checks / pre-commit	23s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, windows-latest)	2m 17s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, locked, windows-latest)	2m 12s
checks / test (3.11, locked, windows-latest)	2m 22s
checks / test (3.12, locked, windows-latest)	3m 40s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, windows-latest)	2m 32s
checks / test (3.11, locked, ubuntu-latest)	42s
checks / test (3.13, locked, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	3m 14s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.14, locked, ubuntu-latest)	2m 10s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.14, lowest-direct, windows-latest)	2m 15s
checks / test (3.14, locked, windows-latest)	3m 4s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
all-green	2s
	36m 51s

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