Please consider removing guava as a dependency

[tenor-dev]

Guava is a huge library and bringing it as a dependency to just use 3 simple functions is not a good practice.

[mrts]

Agreed, we ended up using Guava less than we initially expected so it can be removed.

Generally using libraries like Guava or Apache Commons Lang is a good practice even for simple functions as they are battle-tested and have clear thread-safety guarantees.

[mrts]

This is now implemented in #34. Can you please review the pull request? Note that it is based on #33, I will rebase it on top of main after #33 is merged.

[tenor-dev]

@mrts thanks a lot!