feat: add custom content support to ToolError #1979

Job	Run time
checks / pre-commit	36s
checks / test (3.10, lowest-direct, windows-latest)	2m 44s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.14, locked, ubuntu-latest)	2m 27s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.10, locked, windows-latest)	2m 31s
checks / test (3.12, locked, windows-latest)	3m 25s
checks / test (3.13, locked, windows-latest)	2m 29s
checks / test (3.14, locked, windows-latest)	3m 1s
checks / test (3.14, lowest-direct, windows-latest)	2m 21s
checks / test (3.12, lowest-direct, windows-latest)	3m 36s
checks / test (3.11, lowest-direct, windows-latest)	2m 49s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.13, lowest-direct, windows-latest)	2m 44s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.11, locked, windows-latest)	2m 33s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
all-green	4s
	40m 34s

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