Don't implement Copy for types larger than 128 bits. #309

Job	Run time
Cargo check	14s
Minimal dependency versions build	19s
Build with each feature combination	23s
Machete dependencies checks	1m 14s
Clippy lint checks	23s
Code formatting checks	15s
Build & test (nightly, windows-latest)	46s
Build & test (nightly, ubuntu-latest)	22s
Build & test (1.88, macos-latest)	46s
Build & test (stable, macos-latest)	29s
Build & test (1.88, windows-latest)	52s
Build & test (stable, ubuntu-latest)	47s
Build & test (nightly, macos-latest)	35s
Build & test (stable, windows-latest)	1m 36s
Build & test (1.88, ubuntu-latest)	25s
Miri test	1m 12s
	10m 38s

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