Change the hashing algorithm for probabilistic sampler

[jpkrohling]

In the probabilistic sampler, we seem to use a hashing algorithm of our own, instead of relying on a library to do so, as it's done in other modules. We should try to follow the guideline we have on this:

https://github.com/open-telemetry/opentelemetry-collector/blob/main/CONTRIBUTING.md#recommended-libraries--defaults

Originally posted by @MovieStoreGuy in #14920 (comment)

[moonbox3]

@jpkrohling I'd like to work on this issue, if possible. I'm new to the project and will spend time time wrapping my head around things. I'll most likely come back with questions.

[fatsheep9146]

@moonbox3 It's yours! Thanks!

[moonbox3]

Created the PR for this here.

[jpkrohling]

Thank you!