Move `TraceLde` constructor into `Prover` trait #836

Job	Run time
Clippy	29s
rustfmt	20s
no-std (stable, wasm32-unknown-unknown)	58s
Check with --all-features	37s
Test Rust stable on ubuntu	1m 44s
no-std (nightly, wasm32-unknown-unknown)	57s
Check with --no-default-features	34s
Test Rust nightly on ubuntu	1m 55s
	7m 34s

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