feat(stdlibs): add package crypto/bech32

[Villaquiranm]

Related to #1475

[Gno2D2]

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[n2p5]

This looks really good, I have a note on a comment you left in the code, but it otherwise seems like a pragmatic and straightforward PR.

Open question here: For libraries that we port from go -> gno. Do we have an established pattern where I can use some reference data, expected inputs and outputs, and run both the go and gno implementations to show that I get the exact same outputs between both systems? It seems like this would be a really nice way to prove feature parity.

[jefft0]

Removed the review/triage-pending label because this PR was reviewed by core dev n2p5.

[n2p5]

LGTM