Modify FFI client methods to avoid task spawning #595

Job	Run time
bindings-macos (macos-14, aarch64-apple-darwin)	2m 2s
bindings-windows (x86_64-pc-windows-msvc, true)	9m 17s
documentation	5m 16s
bindings-macos (macos-13, x86_64-apple-darwin)	3m 21s
features (--no-default-features)	1m 35s
bindings-windows (i686-pc-windows-msvc, false)	3m 31s
features (--no-default-features --features serial)	1m 43s
features (--no-default-features --features tls)	1m 57s
ffi-cross (x86_64-unknown-linux-gnu)	2m 34s
guide	1m 5s
ffi-cross (x86_64-unknown-linux-musl)	2m 38s
ffi-cross (arm-unknown-linux-gnueabihf)	2m 36s
linting (stable)	48s
test (ubuntu-latest, stable)	1m 10s
linting (beta)	46s
test (ubuntu-latest, beta)	1m 7s
ffi-cross (arm-unknown-linux-musleabihf)	2m 47s
test (windows-latest, stable)	2m 13s
ffi-cross (aarch64-unknown-linux-gnu)	2m 34s
test (windows-latest, beta)	2m 38s
ffi-cross (aarch64-unknown-linux-musl)	2m 39s
ffi-cross (armv7-unknown-linux-gnueabihf)	2m 37s
ffi-cross (arm-unknown-linux-gnueabi)	2m 40s
packaging	0s
release	0s
	59m 34s

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