Feat/stream cipher

[driemworks]

• closes Create timelock library #6
• introduces greater modularity for the timelock library by introducing a StreamCipherProvider to allow any cipher to be specified (e.g. AES GCM by default, but could support AGE or others)
• refines benchmarks
• introduces wasm bindings for the timelock encryption rust library

[juangirini]

It looks good. Most of my comments are just nits or suggestions.
There are two issues to be addressed before merging:

• tlock bench does not compile, it's just a matter of bringing the right imports
• benches and wasm throw compile warnings

Also, there are a few unwraps that would be good to tackle in another PR.

Lastly, I got a bit lost with all the variants: tlock, tle and timelock. They are all used across the repo, would it make sense to unify the terminology?

[juangirini]

👍