fix: allow extra fields on RequestParams to match TypeScript SDK #1050

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	36s
checks / test (3.11, lowest-direct, windows-latest)	2m 38s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.12, lowest-direct, windows-latest)	3m 48s
checks / test (3.10, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.10, locked, windows-latest)	2m 17s
checks / test (3.11, locked, windows-latest)	2m 22s
checks / test (3.14, locked, windows-latest)	3m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, lowest-direct, windows-latest)	2m 24s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, windows-latest)	2m 27s
checks / test (3.12, locked, windows-latest)	3m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.13, locked, windows-latest)	2m 16s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.13, lowest-direct, windows-latest)	2m 38s
checks / test (3.13, locked, ubuntu-latest)	44s
all-green	3s
	38m 57s

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