fix: Make PaseEncoder Sendable (#175) #662

Job	Run time
linux	2m 17s
spm-test	3m 58s
windows	2m 30s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	6m 22s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	5m 16s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 47s
test (platform=macOS, test)	6m 0s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 47s
xcode-test-5_5	1m 36s
docs	45s
cocoapods	8m 46s
	41m 4s

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