server+util: Limit max request sizes, prealloc request buffers #10522

Job	Run time
YAML Lint	15s
Generate Code	1m 7s
Go Lint	1m 34s
Rego PR checks	1m 27s
WASM	9s
Go Build (linux amd64)	2m 20s
Go Build (linux arm64)	2m 7s
Check Generated	23s
Go Test (linux)	4m 34s
Go Build (linux arm64GO_TAGS="-tags=opa_no_oci")	2m 3s
Go compat build/test (ubuntu-22.04, 1.21)	2m 46s
Go Test (darwin)	4m 51s
Go compat build/test (macos-14, 1.21)	3m 55s
Go Build (windows amd64)	2m 23s
Go Race Detector	6m 45s
Go Build (darwin amd64)	1m 25s
Go Build (darwin arm64)	34s
docker image smoke test	32s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64, amd64)	15s
smoke-test-binaries (linux, ubuntu-22.04, opa_linux_amd64_static, amd64, disabled)	15s
smoke-test-binaries (darwin, macos-13, opa_darwin_amd64, amd64)	26s
smoke-test-binaries (darwin, macos-14, opa_darwin_arm64_static, arm64, disabled)	14s
smoke-test-binaries (windows, windows-latest, opa_windows_amd64.exe, amd64)	24s
	40m 44s

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