Modify FFI client methods to avoid task spawning #600

Job	Run time
documentation	3m 13s
bindings-windows (x86_64-pc-windows-msvc, true)	7m 18s
bindings-macos (macos-14, aarch64-apple-darwin)	2m 7s
features (--no-default-features)	1m 43s
bindings-windows (i686-pc-windows-msvc, false)	4m 7s
bindings-macos (macos-13, x86_64-apple-darwin)	4m 54s
features (--no-default-features --features serial)	1m 49s
features (--no-default-features --features tls)	2m 3s
ffi-cross (x86_64-unknown-linux-gnu)	2m 31s
guide	1m 18s
ffi-cross (x86_64-unknown-linux-musl)	2m 43s
linting (stable)	45s
ffi-cross (arm-unknown-linux-gnueabihf)	2m 34s
linting (beta)	47s
test (ubuntu-latest, stable)	1m 9s
ffi-cross (arm-unknown-linux-musleabihf)	2m 45s
test (ubuntu-latest, beta)	1m 6s
ffi-cross (aarch64-unknown-linux-gnu)	2m 36s
test (windows-latest, stable)	2m 42s
ffi-cross (aarch64-unknown-linux-musl)	2m 57s
test (windows-latest, beta)	2m 4s
ffi-cross (armv7-unknown-linux-gnueabihf)	2m 41s
ffi-cross (arm-unknown-linux-gnueabi)	2m 51s
packaging	1m 46s
release	0s
	1h 0m 29s

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