feat: support `FormData` #540

Job	Run time
test / Lint Code	20s
test / Test Fastify Integration	1m 24s
test / Dependency Review	3s
test / Check Licenses	19s
test / Test (14, macos-latest)	41s
test / Test (14, ubuntu-latest)	30s
test / Test (16, macos-latest)	35s
test / Test (16, ubuntu-latest)	27s
test / Test (16, windows-latest)	30s
test / Test (18, macos-latest)	42s
test / Test (18, ubuntu-latest)	31s
test / Test (18, windows-latest)	30s
test / Test (20, macos-latest)	40s
test / Test (20, ubuntu-latest)	26s
test / Test (20, windows-latest)	29s
test / Test (21, macos-latest)	44s
test / Test (21, ubuntu-latest)	32s
test / Test (21, windows-latest)	30s
test / Automerge Dependabot PRs	0s
	9m 53s

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