test(encryption): add backwards-compatibility-test for encrypt/decrypt

[legobeat]

Encryption in this library is historically using tweetnacl and tweetnacl-util as encryption libraries. tweetnacl-util was replaced with @scure/base in #358 and tweetnacl is also due for removal.

This adds a snapshot of encryption.ts as test-legacy-encryption.ts, and adds compatibility tests in both directions to ensure that new versions of the code can decrypt messages produced by the old version and vice-versa.

It does this by wrapping the entire existing encryption-test-suite and injecting the functions under test.

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Note for reviewers: Most of the diff in encryption.test.ts is indentation, which can be ignored by git diff -w).

[socket-security]

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Package	New capabilities	Transitives	Size	Publisher
npm/tweetnacl-util@0.15.1	None	0	8.14 kB	dchest

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