feat(rust): Time Module Implementation

[saibatizoku]

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Closes #88

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[stevenj]

Also needs the wasi/clock APIs as these are part of the Time utilities for Hermes.

[stevenj]

Wall clock can just be implemented using:
https://doc.rust-lang.org/std/time/struct.SystemTime.html
Use the constant UNIX_EPOCH as the base for wall clock.
Then get elapsed().as_nanos() which will return a u128 which can be mapped into the sec/nanosec of the wasm return type.

Again, resolution here would always be nanosceonds.

[stevenj]

LGTM

[FelipeRosa]

LGTM