feat: enable to use libsodium version ostracon

[ulbqb]

Description

This PR enable to use libsodium version ostracon. We can use libsodium version ostracon by the following command.

$ LBM_BUILD_OPTIONS=libsodium make install      

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

[tnasu]

Would you add the test with libsodium on github actions?

[ulbqb]

Would you add the test with libsodium on github actions?

@tnasu OK, I'll add test. However, adding tests does not guarantee that ostracon is using libsodium. There seem to be no way to tell if ostracon is using libsodium.

[tnasu]

@ulbqb Yes, it does. ostracon doesn't tell us whether to use libsodium and what kind of tm-db-backend it uses. It's not convenient. (Thanks for your creating a issue: Finschia/ostracon#486)

But, lbm-sdk is tested with goleveldb, so I recommend adding the test with goleveldb and libsodium.

[zemyblue]

I think this change need to be applied in lbm-sdk v0.46.0-rcx. So could you change the target branch to rc9/v0.46.0?

[ulbqb]

@zemyblue
OK. But changing the target branch broke this PR, so I force-pushed.

[zemyblue]

LGTM