Add NIFSGadgetTrait, implement Mova's NIFSGadget, adapt Nova NIFSGadget into NIFSGadgetTrait #906

Job	Run time
Build target wasm32-unknown-unknown	3m 41s
Clippy lint checks (basic)	2m 14s
Rustfmt	19s
Build target wasm32-wasi	3m 36s
Clippy lint checks (wasm)	1m 4s
Run examples & examples tests	14m 5s
Test (basic)	23m 32s
Spell Check with Typos	6s
	48m 37s

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