Exposed SaplingVerificationContextInner for mocking purposes. #486

Job	Run time
Bitrot check	57s
Build target wasm32-unknown-unknown	44s
Nightly lint	14s
Build target wasm32-wasi	41s
Intra-doc links	1m 17s
Lint	46s
Rustfmt	12s
Security - Cargo Audit	2m 55s
Test on ubuntu-latest	3m 18s
Test on windows-latest	5m 54s
Test on macOS-latest	8m 40s
	25m 38s

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