docs: Add guide on validating Actor input with Pydantic #677

Job	Run time
PR title check	5s
Checks / Actions lint check	30s
Checks / E2E tests (3.11, ubuntu-latest)	4m 53s
Checks / Integration tests (3.11, ubuntu-latest)	2m 36s
Checks / Integration tests (3.14, ubuntu-latest)	2m 51s
Checks / E2E tests (3.14, ubuntu-latest)	5m 30s
Checks / Spell check	6s
Checks / Package check	17s
Checks / Lint check / Lint check (3.12)	10s
Checks / Lint check / Lint check (3.14)	15s
Checks / Doc check / Docs check	1m 8s
Checks / Type check / Type check (3.12)	12s
Checks / Lint check / Lint check (3.11)	11s
Checks / Type check / Type check (3.13)	12s
Checks / Lint check / Lint check (3.13)	17s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	1m 31s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	1m 6s
Checks / Type check / Type check (3.11)	12s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	1m 11s
Checks / Type check / Type check (3.14)	12s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	1m 21s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	1m 27s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	1m 6s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	1m 33s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	1m 7s
	29m 59s

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