feat: add custom content support to ToolError #1978

Job	Run time
checks / pre-commit	36s
checks / test (3.11, locked, windows-latest)	2m 41s
checks / test (3.10, locked, windows-latest)	2m 19s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.14, locked, windows-latest)	3m 8s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, windows-latest)	2m 41s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, windows-latest)	2m 30s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.13, locked, windows-latest)	2m 47s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.12, lowest-direct, windows-latest)	3m 53s
checks / test (3.14, lowest-direct, windows-latest)	2m 34s
checks / test (3.12, locked, windows-latest)	3m 21s
checks / test (3.14, locked, ubuntu-latest)	2m 14s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / readme-snippets	14s
all-green	3s
	39m 21s

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